Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfce1a6500e8e6b…

MALICIOUS

PDF

40.9 KB Created: 2020-09-08 20:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0364fd7791deea97f61e926ad497b355 SHA-1: 7eb8a8ccd20adfe253b380bd53556b93a66e2623 SHA-256: 5dfce1a6500e8e6ba410bd37bc41cb19731018d0f4234d94c80a997047193b27
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme, potentially leading to malicious content or phishing pages.

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.link/wix?keyword=feature+article+template+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8605/3527/files/tripadvisor_platform_61.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3001/files/gazibet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/wufegijabapozinibisib.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/siforita.pdf
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/61197999574.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/contractor_contract_template_ontario.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/xefuwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4699/3063/files/57938586845.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/pobuwomapipadegok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8917/files/60919293062.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/pimofufodutov.pdf
    • https://static.usrfiles.com/ugd/48d9a1_b00b6da1b5594eb99e62ce489f9f29b7.pdf
    • https://static.usrfiles.com/ugd/66c878_84da64163f744a43ad5a1de418e053bc.pdf
    • https://static.usrfiles.com/ugd/9a242c_7836331f100948ccb5f903dc8cdfa972.pdf
    • https://static.usrfiles.com/ugd/113e89_1bf09174f61f4dd79500b6d2f7191a59.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_off00006364.bin
16c9736f1a91c35cd974801adecdd6875dcda2211ba64352708c46cb1a1863d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6364 4856 bytes
font_01_sfnt_off000073d6.bin
3c74bbdde2bd6dc3f034a2c2b3cc5285dbebdd3d8e85e8a73e87f9b951a81fae
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D6 10304 bytes