Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a24911ff93caccb…

MALICIOUS

PDF

36.5 KB Created: 2020-07-27 13:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0c444237b48667c4496868c28a7dd4b SHA-1: 7a82d7dc6a57f55bd0c09da5262d0d992445cbf1 SHA-256: 7a24911ff93caccb2be83ea77110478c18da82587ad36481ca42a981d24345b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary link points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=atmosphere+brush+font
    • http://files.thevimlife.com/uploads/1/3/1/3/131383760/85bde27824d877f.pdf
    • http://files.tanurhideboerne.com/uploads/1/3/0/7/130739809/pigimojubajepik.pdf
    • http://files.ellvenus.com/uploads/1/3/0/7/130776416/ba15758f7ace9f.pdf
    • http://files.tienyue.com/uploads/1/3/0/8/130813458/dazifenurosiwo-fagajenasaba-xapun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/9449704064.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/4988047420.pdf
    • https://cdn.shopify.com/s/files/1/0428/8013/9423/files/30760908185.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/susuwojejizogoreni.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/45981353590.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/58317720179.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/kosaxogu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/mogomozujeme.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/67311694028.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054ec.bin
09a8c9da3dad549e03d9f699edff5400d2dbecceec4b673cd8aab83c9b553021
pdf-font-stream PDF embedded font (sfnt) at offset 0x54EC 4860 bytes
font_01_sfnt_off00006546.bin
a295a5b85d9b9b320c78812b2a494b8d5a1857b544e3bb1ffd3e9447fd00926d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6546 9388 bytes