Malicious PDF — malware analysis report

Static analysis result for SHA-256 091dd1c70baab1a9…

MALICIOUS

PDF

94.4 KB Created: 2020-08-12 15:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e53dc3885e2cb00c74552b212e2962 SHA-1: a1ffb00ba27e838047576ab8599ded97a98c4e11 SHA-256: 091dd1c70baab1a9a445ca8d5f50be06eda2d6168de062625ae42a425f220a4a
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that, when clicked, redirects to a malicious URL identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for 'anticoagulation guidelines chest pdf'. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt.

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.com/pify?keyword=anticoagulation+guidelines+chest+pdf
    • http://files.elevenbillionpeople.com/uploads/1/3/0/7/130739225/8d205e7c4e535d.pdf
    • http://files.lauraavnaim.com/uploads/1/3/0/9/130969819/0ec2ee5.pdf
    • http://misun.thoughtprovokingmomentsblog.com/uploads/1/3/0/7/130776483/7276805.pdf
    • http://lajejik.carywoodcarving.com/uploads/1/3/1/3/131398591/xavejedebilufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/rujanurisilumipan.pdf
    • https://cdn.shopify.com/s/files/1/0428/0441/2583/files/55334022053.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/68165787548.pdf
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/devejufuzivas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/kigadanebojupol.pdf
    • https://cdn.shopify.com/s/files/1/0428/7673/1558/files/bestiariusz_starego_wiata_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52299098946.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/81670325829.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5240/files/6519506692.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/fokaxutubenese.pdf
    • https://cdn.shopify.com/s/files/1/0429/9833/3599/files/bissell_proheat_2x_pet_manual.pdf
    • https://cdn.shopify.com/s/files/1/0448/7377/7319/files/epidemiologia_libros.pdf
    • https://cdn.shopify.com/s/files/1/0436/5955/9065/files/zitipifujo.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_off00013235.bin
aff68cab4f5aed2980421f4b3dae0414ea83a55a73e9f42492e5e517b5c5a3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 5308 bytes
font_01_sfnt_off0001443f.bin
c3c306bff705e68cd0d64e80ca8a0db668560b495505331c63a023361ea3a380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1443F 12432 bytes

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