Malicious PDF — malware analysis report

Static analysis result for SHA-256 133d7899a32bffa4…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 04:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a35063a65d8fc4847e9580ed94f22e4 SHA-1: be475f7c9cf45136fbae45e3328fa1f3bd83a1e5 SHA-256: 133d7899a32bffa47753e2b70c067358e0d2159ff7c362e5789cd08c29600e3a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body also contains this URL, presented as a 'plasma cutter manual', suggesting a lure. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links to Shopify-hosted PDFs, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicates a phishing or redirection attempt.

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.ru/wix?keyword=zeny+cut+50+plasma+cutter+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/47365404585.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/guxagigogegesez.pdf
    • https://cdn.shopify.com/s/files/1/0464/4824/6952/files/cmake_ultimate_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/sipawewomurojoli.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/zelebajewufanopivuxebim.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/cestui_que_vie_trust_act_1666.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/32278958699.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/mokorafebuvofuwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2785/files/megaloblastic_anemia_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/kotubaladekotitoro.pdf
    • https://static.usrfiles.com/ugd/5bb01c_a6967cfebf1a482ea19219f39a201337.pdf
    • https://static.usrfiles.com/ugd/51c472_4ba5ae7ffd0e465ab463e98fceff8b92.pdf
    • https://static.usrfiles.com/ugd/bfbc46_460adc0cca074efab92ebdb03505e41c.pdf
    • https://static.usrfiles.com/ugd/735189_3c5630dc8ff643cc83cdd55a8ba4490e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0675bf0d342c4dc788b86726e2943cd5.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_off00006645.bin
ca6bcc8e7b23914a415fa233738e9a27a7e061ebcc78b1b13ea7bd9c69cab836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6645 5404 bytes
font_01_sfnt_off0000789d.bin
d0aa310f27f01755a036f4b1c5c9d4697ed1bf98a98da05530f9965b1f78222a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789D 10268 bytes

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