Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5b6758accd5a0a…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 07:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e9b1a3c06ce541b88d5c2be37d6457 SHA-1: 11c1958a309f870f051f02a76f45bfee5f000e7b SHA-256: 3a5b6758accd5a0a6b96e723a78eb94cf93206cf2279a9f9650f5f630e328b27
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or truncated, but the presence of the malicious redirector URL and the link farm strongly suggest a malicious intent, likely to lure users to malicious sites or to engage in SEO poisoning tactics.

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=mary+did+you+know+pentatonix+sheet+m
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/sunefozesejepowigiguf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/evangelios_apocrifos_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/negative_personality_adjectives_list.pdf
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/26910283001.pdf
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/96709353417.pdf
    • https://static.usrfiles.com/ugd/4cf28d_4ba7a666442542269c2754b0fc30c612.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9843def85c248e6a25c0dfb447b3b62.pdf
    • https://static.usrfiles.com/ugd/b8c837_05e8dd3f692e42dd9d7b98aabf6b5b1c.pdf
    • https://static.usrfiles.com/ugd/48d9a1_a7c8a96646aa4d31b3ab38fe8a263f65.pdf
    • https://static.usrfiles.com/ugd/7d21c0_cbe5c6e6898640f98bc3dd103fcf2f11.pdf
    • https://static.usrfiles.com/ugd/41a0b6_7799584c47fe458f933a7db11fd36839.pdf
    • https://static.usrfiles.com/ugd/33a2e4_eaca26b703ad40ed8daaf879390ffdce.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/wasumaziwigiguk.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/after_effects_cc_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/storytelling_livro.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_off000060c5.bin
489bc87ea00c3e9890582e6eb32121f7a6ad98f814052a1ba962929b8c6883f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C5 5496 bytes
font_01_sfnt_off0000736d.bin
41a95c72f74b20ce36c2696b19db71c8b468b1f12bcf4446b7190e9d24955562
pdf-font-stream PDF embedded font (sfnt) at offset 0x736D 14804 bytes