Malicious PDF — malware analysis report

Static analysis result for SHA-256 790b4785b13f2242…

MALICIOUS

PDF

35.2 KB Created: 2020-08-01 12:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08233aadbf24f0a0d2cc27a7248850aa SHA-1: 8525369dd1ba6a952496aea87d47595409198d17 SHA-256: 790b4785b13f22423c2c8660b1de872e63b31302be3bb9d8173f23f943910401
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting an SEO link farm. One prominent link directs to `https://ttraff.ru/pify?keyword=ruger+1022+manual`, which is flagged as a malicious redirector. This indicates a likely attempt to drive traffic to malicious infrastructure, possibly for phishing or malware distribution, under the guise of providing a manual.

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.ru/pify?keyword=ruger+1022+manual
    • http://files.melitaharvey.com/uploads/1/3/1/3/131397927/vekerubix.pdf
    • http://files.practiceflute.com/uploads/1/3/1/4/131455543/4919089.pdf
    • http://files.audiosolutionsplus.com/uploads/1/3/1/3/131383720/xakifuxuj_wozumajulotasol_kabis_fewinalepi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8074/4089/files/29104738163.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93236297381.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/tomafepulabuwitadenerezel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/nizefeniviruji.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/pawafewuranawes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pawatofamilafal.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/dagadazadefisumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/90814189352.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/dotaxirewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/29547654655.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/28544544459.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_off00004a61.bin
7c806a23733f8b6cea06f8996a5bc7e7181a4246195249993d01871e968ce1e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A61 5160 bytes
font_01_sfnt_off00005be0.bin
92c857c330da7d2931f0154f870a313a6e2897abf2ed3800921d5703d2cadb5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE0 10184 bytes