Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbb2fe246324be0…

MALICIOUS

PDF

59.0 KB Created: 2020-08-12 23:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fda1e79c900342b1aa30f31a90d71da SHA-1: 29b81f743342946c9adaa24d63d91360be4cc345 SHA-256: 5cbb2fe246324be0752a19a0c5f7342856455c0185dc5d34c0296a4d9cfd04a1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded links and the heuristic firings suggest an attempt to redirect the user to malicious infrastructure, likely as part of a phishing or scam 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/wb?keyword=manual%20fiat%20palio%20economy%202011
    • http://files.flyingcoloursmusic.co.nz/uploads/1/3/1/1/131163578/tatagosedub-wepetaji.pdf
    • http://files.rosconkie.com/uploads/1/3/1/3/131379312/5510049.pdf
    • http://files.valordnorwegianelkhounds.com/uploads/1/3/1/1/131163872/jezalijed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/important_physics_constants.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/white_wolf_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/28952591779.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/problemas_caida_libre_4_eso.pdf
    • https://cdn.shopify.com/s/files/1/0436/0024/8995/files/volume_formula_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0852/3416/files/sword_of_wounding_5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/83147112491.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/45386625992.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/vovavajugen.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/31503561472.pdf
    • https://cdn.shopify.com/s/files/1/0449/3757/6603/files/adhesive_intestinal_obstruction.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/tewowizawip.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/92251721822.pdf
    • https://cdn.shopify.com/s/files/1/0431/1092/4437/files/19799825301.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_off0000980d.bin
b2963a27cc969c0437017c375aea8cc8c2f141e7ad9754d06424f8a80d6d91eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x980D 5320 bytes
font_01_sfnt_off0000aa30.bin
f1621c564dc9ceb863ebd0f0050c0b8e8727f4be728fbc4910393fc49e46b4cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA30 17628 bytes

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