Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bba26913bfef1a0…

MALICIOUS

PDF

42.7 KB Created: 2020-08-20 11:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9189ef1ffe86b986bec204cf2c8b64a9 SHA-1: 04a5ddd5387d20679a15338ec3ceb0a88990aaa3 SHA-256: 7bba26913bfef1a0e9de228aa5321dcea9c97bb497d3018a27847d9966702879
194 Risk Score

Malware Insights

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

The PDF contains numerous links, with several heuristics flagging it as a link farm and a malicious redirector. The primary redirector URL is https://ttraff.ru/pify?keyword=aa+ante+amalapuram+song++masstamilan, which likely leads to malicious content. The document body itself is heavily obfuscated but contains references to URLs, suggesting an attempt to distribute or redirect to further malicious resources.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=aa+ante+amalapuram+song++masstamilan
    • http://files.mastercreatorsadventureretreat.com/uploads/1/3/1/4/131406182/vupuro.pdf
    • http://files.lizsandwick.com/uploads/1/3/0/7/130775518/52a8c4.pdf
    • http://files.blueacesbakeshoppe.com/uploads/1/3/1/3/131398279/xekejogadax_mopukekatiwad.pdf
    • http://files.nycctc.org/uploads/1/3/2/6/132681579/visavekalivoguxisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/4849/3475/files/tevolirugopaziwilovefonav.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/wumokenowulivoresozuxuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/mikajilog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/birizakidunupujudexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0093/files/94349119897.pdf
    • https://cdn.shopify.com/s/files/1/0430/8441/5143/files/biochemical_reactions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/28968223178.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/lululukakafujupuwoguvejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0768/files/lawomibojisutasoliforu.pdf
    • https://cdn.shopify.com/s/files/1/0443/0499/0364/files/bare_necessities_easy_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/xakubuxajibod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000595a.bin
47c15adad83f4e58975f3b86550862acacb4e107d945b97fef28b471b46b18ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x595A 5012 bytes
font_01_sfnt_off00006a42.bin
55b514dac5c82e63861f3d7317f87465fdd74b5fe001e78a5571b5cc8a0b46fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A42 10968 bytes
font_02_sfnt_off00008fa1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA1 4324 bytes

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