Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5842979d907b8f…

MALICIOUS

PDF

48.2 KB Created: 2020-09-02 13:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78a02463b3b8a3e0ab4045a098364546 SHA-1: 3ccd948c0dcd2b7cecb8cbc2f09dc6aac900d217 SHA-256: 5d5842979d907b8f46d47f71675bfef5c7cb78ca115fb8d11ae8b694b118b4ac
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 pointing to Shopify domains, but one critical link to `ttraff.cc` is flagged as malicious. This suggests a tactic of using a link farm to obscure malicious redirectors. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for traffic redirection or SEO manipulation.

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=centos+7+manual+ip+address
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/xekaxiwovav.pdf
    • https://cdn.shopify.com/s/files/1/0428/3446/0828/files/70525597507.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8661/files/6309762417.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6471/files/lubenudutomedil.pdf
    • https://cdn.shopify.com/s/files/1/0437/1339/6901/files/75641703244.pdf
    • https://cdn.shopify.com/s/files/1/0438/1330/6530/files/a4988_stepper_motor_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/draft_compromise_agreement_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/7111/0310/files/14423476220.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/rusavidodimotawep.pdf
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/97040730861.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/56349777847.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/mascarpone_cheese_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0440/6539/0757/files/73490377437.pdf
    • https://cdn.shopify.com/s/files/1/0434/6416/3490/files/56025133283.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/map_vs_foreach.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_off00006369.bin
8fcd8ba17b15722ab6e3e4176a29051219effd93b2f841687a87ea6485e21fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6369 5088 bytes
font_01_sfnt_off0000749f.bin
f3c33743681b375b9235766bec4c2055e91536c907c1e2d950132f7b040ea29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749F 15360 bytes
font_02_sfnt_off0000a3ec.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3EC 4324 bytes

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