Malicious PDF — malware analysis report

Static analysis result for SHA-256 a578f48a92daa0d9…

MALICIOUS

PDF

40.9 KB Created: 2020-07-08 16:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 4d5739a04becbeb3e5cf24c2f51789d9 SHA-1: 8bdcea0ae63ec7a4c7bdebc048995a5190e1c8c0 SHA-256: a578f48a92daa0d9d7c9af02c156bf60e933306805410048689b18c2de8034c3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though obfuscated, also contains URLs that appear to be part of this link farm. The primary function of this document is to serve as a link farm, likely for SEO manipulation or to distribute traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=bikini+bottom+genetics+incomplete+dominance+worksheet In PDF document text
    • http://files.pemmensgolf.net/uploads/1/3/1/3/131379612/febokibilodirina.pdfIn PDF document text
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdfIn PDF document text
    • http://files.lucycampbell.net/uploads/1/3/1/3/131380158/nobufamakaxaxe-kenupewel-nazusit.pdfIn PDF document text
    • http://files.worldwarc.ca/uploads/1/3/0/8/130815095/xokevogetuwa.pdfIn PDF document text
    • http://files.shakerrentals.com/uploads/1/3/2/8/132815752/jabiratijoso-zamedo.pdfIn PDF document text
    • http://files.whistlingfrogresort.com/uploads/1/3/2/6/132681002/masaberilanimubaloji.pdfIn PDF document text
    • http://files.tanyagoldhaber.com/uploads/1/3/0/7/130776481/kotofuvixanun.pdfIn PDF document text
    • http://files.beitnachum.org/uploads/1/3/1/4/131483253/ximegigojepirez_rabisosip_suwupisi.pdfIn PDF document text
    • http://files.morethansoulfood.net/uploads/1/3/2/3/132302973/timuf.pdfIn PDF document text
    • http://files.pamsteashoppe.com/uploads/1/3/1/3/131384789/59b03f6f49c09c.pdfIn PDF document text
    • http://files.angkorvetclinic.com/uploads/1/3/1/3/131379353/2566871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zizuxufu.files.wordpress.com/2020/06/39648318443.pdfIn PDF document text
    • https://nemogodulivo.files.wordpress.com/2020/06/ronoxo.pdfIn PDF document text
    • https://mudosezu.files.wordpress.com/2020/06/sezofugadajuvup.pdfIn PDF document text
    • https://fobigagebe.files.wordpress.com/2020/06/46724861661.pdfIn PDF document text
    • https://vimagifa577894512.files.wordpress.com/2020/06/lunisawo.pdfIn PDF document text
    • https://levamine.files.wordpress.com/2020/06/6724767561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/82595467958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6046 5620 bytes
SHA-256: ee00a11c61080994137f1afe6b2fdde4a8fd6cd59c48981676f2426f980f415f
font_01_sfnt_off0000732f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 10332 bytes
SHA-256: 6c233a93655669518c8cf51ea582f6524728263bd18b41a9817bed9f0203d6a7