Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb28e9d3bb30a99…

MALICIOUS

PDF

58.1 KB Created: 2020-07-26 09:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 9227c0c5016d25aff59ba2ac1096d59d SHA-1: e1c0c8fabb4b14ba4baab3c75aa06d6201208d5e SHA-256: 1fb28e9d3bb30a9942857cbefbeba5ef57eca7690e7ffda8112b77690480b0a5
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to a URL that appears to be a lure for downloading software. The document body, though heavily obfuscated, contains text fragments related to 'Pdf-xchange viewer pro' and 'keygen', reinforcing the social engineering pretext. The presence of numerous embedded links, many pointing to Shopify domains, suggests a link farm used for SEO poisoning or distributing malicious content.

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.cc/wb?keyword=pdf-xchange%20viewer%20pro%202.5.198%20full%20download%20+%20keygen In PDF document text
    • http://files.gunsgreenhouse.org/uploads/1/3/1/4/131406435/xazezel-feraparoxebepu-korowime-jeludafujuwude.pdfIn PDF document text
    • http://files.merredincrc.com/uploads/1/3/0/8/130814232/3020e6c0482d935.pdfIn PDF document text
    • http://files.marandihostetter.com/uploads/1/3/2/8/132814272/42f1bf.pdfIn PDF document text
    • http://files.turbochef-bay-area.com/uploads/1/3/1/4/131406885/8702937.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/1/0432/4101/3412/files/kixikalidanigipinaletigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapitawaluzosamorexub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3831/7464/files/12864537773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/fipanigetorufuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dosadibevejigavo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/jumesadinuxobijujinazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/xugakorurenaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/48852988042.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/tojulasabovigudezavokaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/30185374414.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/vijigogalasisibezunikug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/97124552720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1230/9670/files/matitagikivozesapugeraxig.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AC 6148 bytes
SHA-256: a31d760be8bb2fd52427f1d0b88cdd73281ab7d2e539820912e63337bcf5c753
font_01_sfnt_off0000acb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB2 14748 bytes
SHA-256: 0b20509c8514d138d15d44782a6badb90e6235da7a36326dd08ee7b73b8bcb6f

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