Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b121fc2458df60…

MALICIOUS

PDF

43.4 KB Created: 2020-08-09 18:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93e49e2720c0be7c094d4aabe8061db1 SHA-1: ddbc0f8479ac811e46b07deeb79b9c63fa8a3f7b SHA-256: 68b121fc2458df60670cca46f88a6b79f8f416f28ecc461dd5e72bec6102990a
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 a link farm hosted on Shopify, and one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting an attempt to trick users into clicking it. The presence of numerous external links indicates a likely SEO poisoning or link farm tactic to distribute 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.cc/pify?keyword=cfop+method+pdf
    • http://files.fourseasonsgoldenretrievers.com/uploads/1/3/0/8/130813614/gofewim_rimasiwu_zabitoza_gasagejew.pdf
    • http://files.wingsdance.com/uploads/1/3/1/8/131871602/6a038b15ffb11.pdf
    • http://jopoj.synthemumpoodles.com/uploads/1/3/1/4/131483281/156710.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufotiniponekurek.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/lodozivakubak.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/algebraic_expression_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/wobosebaritup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/7580237576.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/anormalidad_y_normalidad.pdf
    • https://cdn.shopify.com/s/files/1/0428/7807/5036/files/febesatajedaxexivabunox.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/tezaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/42184097075.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/98459147929.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/43018797530.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xomekanob.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7991/files/gufuvi.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_off000062c3.bin
02365d6d15960047a9694e7f2537c0ec85e756fae82b5f66f3534a2d753d5e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 3276 bytes
font_01_sfnt_off00006e7e.bin
0cc017254f71782126739a593c841d9cbcebe71f84339012e3a239c81edb2afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7E 4672 bytes
font_02_sfnt_off00007e40.bin
ce3f916557bf7e278a22c7022b000b323ba190ef1d69ef5091a7364761de6838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E40 10092 bytes

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