Malicious PDF — malware analysis report

Static analysis result for SHA-256 606ac2942f8c0e06…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 14:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ed5d372cd639404e5570eb21af479ba SHA-1: 086fc87182b3671e68124eff8d22c8fd7a0063b2 SHA-256: 606ac2942f8c0e061926b5fbf5fb64f2f34dbdf2b3b32f1310b348e6a0532e4e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though partially obfuscated, includes a URL that matches the redirector's target. This suggests the primary purpose is to direct users to malicious infrastructure, likely for phishing or further malware delivery. No scripts were extracted, but the presence of embedded links and the ML classifier's high confidence indicate malicious intent.

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=como+se+clasifican+los+textos+litera
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/44633908309.pdf
    • https://cdn.shopify.com/s/files/1/0433/1103/8632/files/workforce_planning_and_employment.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/pikojofis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/98281977623.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/3288151559.pdf
    • https://cdn.shopify.com/s/files/1/0434/3074/0135/files/nike_brand_guidelines.pdf
    • https://static.usrfiles.com/ugd/5af86b_1653ec0c85c44162aca9551d19c5d7bf.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_04db0fabe7f1416eb358fd625d10d639.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1f77c90893a4412aaa3473ad3b14f38.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a65298334da4510b6ed68a339334389.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6520/files/36504043810.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8947/files/23988707509.pdf
    • https://cdn.shopify.com/s/files/1/0454/3060/3932/files/92439249304.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/chess_rush_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/83605425798.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_off0000800e.bin
5f86f77ad772b07b12540d235a5cb1255ebf2270ff3866f369b36453475c44c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x800E 5000 bytes
font_01_sfnt_off000090f5.bin
cf19dcc4986dc9be01f170d3c11b568316d8b709c2b97cbf4b2ca1533826a1ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x90F5 11328 bytes