Malicious PDF — malware analysis report

Static analysis result for SHA-256 88784fcd28858802…

MALICIOUS

PDF

54.1 KB Created: 2020-08-29 22:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c688510a662f833919f9758d9dad6b2 SHA-1: 1476f0b121a6473099b64011fcf06dec4e86e577 SHA-256: 88784fcd28858802bf16a59d0b53ac0cb3deb34d02812222cd06a8b2cc280a5a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that point to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The presence of numerous external links, many hosted on Shopify, suggests a link farm for SEO poisoning or to obscure the final malicious destination.

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/wix?keyword=ley+cero+de+la+termodinamica+ejercic
    • https://cdn.shopify.com/s/files/1/0429/1287/4662/files/luxoluwineteruvemowivub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/boondocks_pictures_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/41393683715.pdf
    • https://cdn.shopify.com/s/files/1/0454/3918/9142/files/36406889895.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/wajojonumijo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/jikezarisugavowev.pdf
    • https://cdn.shopify.com/s/files/1/0430/5957/6986/files/sugit.pdf
    • https://static.usrfiles.com/ugd/b8c837_24cb71bbbc564c1cbb2561a0e2439c05.pdf
    • https://static.usrfiles.com/ugd/63022f_d86ff279f772411784a0ea759cda0085.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ae98099124d4e1a86b3c9530ce728b7.pdf
    • https://static.usrfiles.com/ugd/8b9728_76d42e86af0b4000b28aac6ae5b98640.pdf
    • https://static.usrfiles.com/ugd/b8c837_db807ad428984aeb805101c5fe852525.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e26aba2fe3248e48108a57d43fa3a8c.pdf
    • https://static.usrfiles.com/ugd/bf650e_79e2ce47196645bd801580f65c897252.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/
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000922e.bin
cfad3c846d163caac151ba56e61f7de0f8c6f252f65a5ac93cf4cabcc2932310
pdf-font-stream PDF embedded font (sfnt) at offset 0x922E 5028 bytes
font_01_sfnt_off0000a337.bin
0d1645eb3c879e82121a675976c6c61920fe5f232521797ec92cd39be2c7c719
pdf-font-stream PDF embedded font (sfnt) at offset 0xA337 12556 bytes