Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a6e776b67cb46b…

MALICIOUS

PDF

47.3 KB Created: 2020-07-22 12:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: a96cca503e51a88e64ceb756a8591c5b SHA-1: 6c979e3ab4689af42ce6ba860500d48c53db3e0e SHA-256: 87a6e776b67cb46ba197ff2af16cb292222bbcf5fd95ee88a37f5b6b51705d89
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links designed to appear as free downloads, but the primary link redirects to a known malicious infrastructure. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the use of redirectors and a link farm to distribute other PDFs. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

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/wb?keyword=papercraft%20gundam%20free%20download%20pdf In PDF document text
    • http://files.pmgrouphk.com/uploads/1/3/0/7/130775950/viwulikelekososipaze.pdfIn PDF document text
    • http://files.jennifertitone.com/uploads/1/3/0/7/130775261/binafobu.pdfIn PDF document text
    • http://files.getsumcharters.com/uploads/1/3/1/4/131438211/b2bf429a7f7.pdfIn PDF document text
    • http://files.jhepburnauthor.com/uploads/1/3/1/4/131437457/c8d3f26.pdfIn PDF document text
    • http://files.joekreszfitness.com/uploads/1/3/1/6/131637021/984c478f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/xoxulop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1188/2653/files/lelare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/55286078515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6903/7982/files/gazatavumodotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/nopene.pdfIn PDF document text
    • https://wagenox.files.wordpress.com/2020/06/12382205678.pdfIn PDF document text
    • https://duvuzeso.files.wordpress.com/2020/07/suwilo.pdfIn PDF document text
    • https://wuzuziwe.files.wordpress.com/2020/07/35895167322.pdfIn PDF document text
    • https://jivituxevum.files.wordpress.com/2020/07/60205746832.pdfIn PDF document text
    • https://xidiseso.files.wordpress.com/2020/07/50133286883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/zazenazisinunokegixiji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/fisom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/56037798777.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/10615918889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0377/1041/files/digap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5695/4518/files/gijojovilomiruzamefix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/mulimiwawa.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_off00007512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7512 5224 bytes
SHA-256: a6c43a7455c8853451b995524156c3d2bdda1b05ee8e3cf69c8296c09e48393f
font_01_sfnt_off000086d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D0 12856 bytes
SHA-256: ea03ab5236f247521162d7a605e57bf126a759e95975d033ea269f96f93c6328