Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92b2ba6076f31c7…

MALICIOUS

PDF

42.6 KB Created: 2020-09-10 20:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4ab85a0cf98aabd4876702d506b5b9 SHA-1: be4f1c9df8a8e0fb32609eb8689dee31d52a9526 SHA-256: a92b2ba6076f31c74a84af6dcfd5bfd9d13265aee0c3092fd74f60f1f08f98b9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, disguised as a safety data sheet. The document body also contains numerous links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=safety+data+sheet+acetylene+gas
    • https://cdn.shopify.com/s/files/1/0434/1222/6206/files/rabovowosururumiwiwuwotok.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9560/files/toefl_practise_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/5515/3303/files/wound_infection_antibiotic_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0450/5645/8904/files/project_risk_management_process.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/3894255950.pdf
    • https://cdn.shopify.com/s/files/1/0433/3984/1695/files/daripanikaletatifuboda.pdf
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/cell_cycle_book.pdf
    • https://static.usrfiles.com/ugd/70094d_f5f46a361f64453d9c94e355710806b2.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_bac80984942a465aa9c207422e2d8ec4.pdf
    • https://static.usrfiles.com/ugd/7cefa9_e900764566c84e6ca17036919344a049.pdf
    • https://static.usrfiles.com/ugd/8b49c6_3930ab5b98a049c78e3f47611b1ee0d7.pdf
    • https://static.usrfiles.com/ugd/bb05c1_4332caed18004733a85c5c1120936563.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/71728720928.pdf
    • https://cdn.shopify.com/s/files/1/0438/5721/5648/files/kowesanopebizemekevowuna.pdf
    • https://cdn.shopify.com/s/files/1/0435/0764/6630/files/81010666526.pdf
    • https://cdn.shopify.com/s/files/1/0430/1773/2249/files/66557945948.pdf
    • https://cdn.shopify.com/s/files/1/0429/2457/2835/files/polaroid_frame_photoshop_template.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006871.bin
56185414469f111e2ffe81d5711fc81a4befe7cc8947dd1173771fcbd313fbf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6871 5392 bytes
font_01_sfnt_off00007ad5.bin
8a479e7b3d808ea56efdb2055b3e4088f2fc80cde775820c8515f877c245fcab
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD5 10060 bytes