Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4268b5981447bc…

MALICIOUS

PDF

45.5 KB Created: 2020-07-31 22:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a61b5907fab756895d541658802a0267 SHA-1: 57f998e13ee0107927de1050401bdaf4fa261214 SHA-256: 0b4268b5981447bcb555dc927b916219451d4bfcfe37f97ec3e4bd810a866cc3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though partially obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to various PDF files, some of which are hosted on Shopify. This suggests a phishing or traffic-driving campaign.

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=mount+hard+drive+linux
    • http://files.pithpo.org/uploads/1/3/2/7/132740580/jemuvilubosorogegi.pdf
    • http://files.sitezapp.com/uploads/1/3/0/8/130874422/687509.pdf
    • http://files.armadaseamlessgutters.co.uk/uploads/1/3/0/7/130775129/xilosem.pdf
    • http://files.jemun.net/uploads/1/3/1/4/131437538/zimef-pafitakimu-kazuwapofi-xefulogekasa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3876/1379/files/wuzuzomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/jakatogimetiwixeziwoga.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/waxuxazisagujagif.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/pupef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/novenubetaxavanoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/jakada.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0077/files/jewipugomomujufi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/vapaxul.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/nekiwak.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/16457101453.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/dutamuzovigagag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/totowawosifuwirovopexeber.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/19087555591.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_off00006d05.bin
aa276a41b80d61d4347f19ade9290ea6ffa201ae7f7fd5ff6ae8cf49a2bd4032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D05 4868 bytes
font_01_sfnt_off00007d9d.bin
519fa0d1656ea945faa340455734c0d4ef6dcf5a3bca9c55c52a83cc577eec79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9D 14016 bytes

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