Malicious PDF — malware analysis report

Static analysis result for SHA-256 acabb4287db6b5e6…

MALICIOUS

PDF

41.5 KB Created: 2020-10-10 10:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 548c36175f6528e4356397953b57fbaa SHA-1: 6a7b722a0ffcb7e01819a8df9ba6fbd42ae42f55 SHA-256: acabb4287db6b5e613a29f721238616c08cb9542c4c642920c8bfc6f5a395b5c
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 Shopify domains but are likely part of a link farm to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=machinarium+apk+revdl'. The document body also contains this URL, suggesting an attempt to lure users to download potentially malicious content.

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=machinarium+apk+revdl In PDF document text
    • https://site-1039229.mozfiles.com/files/1039229/11627851700.pdfIn PDF document text
    • https://site-1041285.mozfiles.com/files/1041285/55212015633.pdfIn PDF document text
    • https://site-1041587.mozfiles.com/files/1041587/46641309600.pdfIn PDF document text
    • http://files.smoocavetours.com/uploads/1/3/1/3/131381134/logekirawiwa_gofofin_gelizejidosa_koropuxiva.pdfIn PDF document text
    • http://kanaxivoj.uplandmethodist.org/uploads/1/3/1/1/131163890/gumowej_fawakasodok_kuwijumir_wepumine.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/1/0438/0652/3552/files/kitchen_cabinets_jackson_wy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1260/6110/files/munelefodavuwutoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/wamosefupizenatakuwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7643/9198/files/tigidumob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3081/3592/files/photoshop_torrent_pirate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2746/3324/files/kinetic_family_drawing_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/spectrum_email_setup_windows_10.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D1 5264 bytes
SHA-256: 598004ae9a98c99b535d1d1fb691790d26f9a09729dac1ba1101a606b536e564
font_01_sfnt_off0000729e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x729E 13416 bytes
SHA-256: 306d650f05a083f0d813367659612e64d81f31f2a7822fc5a78e59c54609904f

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