Malicious PDF — malware analysis report

Static analysis result for SHA-256 738524e6051053a9…

MALICIOUS

PDF

34.2 KB Created: 2020-09-17 07:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77dd8f32a3023543cd78e060f78e5b04 SHA-1: 063efa52fc23b7abb6d61df047417241bf03768a SHA-256: 738524e6051053a9a25f66c580e4267f21acd649bbaf826b4a424bd36cfbc244
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, https://ttraff.me/wix?keyword=forrest+gump+movie+questions+worksheet, points to a known malicious redirector, suggesting a phishing or scam attempt. The document's structure indicates it was generated by wkhtmltopdf, and it contains a large number of external PDF links, likely part of a link farm to improve search engine ranking for malicious content.

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.me/wix?keyword=forrest+gump+movie+questions+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5a4b5167-c2ab-42b2-a51d-d480a1198345.filesusr.com/ugd/d6b5da_37f01e8a31254ea5a319524d8a5c14bc.pdf?index=true
    • https://6381daf3-c097-4b9c-a124-f105a5760c99.filesusr.com/ugd/8bf3fc_c9c44a9225314864861e6a78b8cc9775.pdf?index=true
    • https://bacde671-fa54-4ef1-b540-a33f718d24fa.filesusr.com/ugd/b13fd1_33d43a13d56143ee8d59846b1fc0817f.pdf?index=true
    • https://f9cbb735-493a-406a-b1c3-590ffe683949.filesusr.com/ugd/6c032c_89f77c0e75de4ba0ae2f87ddc1ddc516.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/38755711748.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/78182257002.pdf
    • https://cdn.shopify.com/s/files/1/0441/3734/9272/files/disaster_recovery_and_business_continuity_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/two_weeks_grizzly_bear_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/google_drive_apk_new_version.pdf
    • https://cdn.shopify.com/s/files/1/0459/5263/0943/files/executive_director_resignation_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1187/4716/files/zumosibekidamola.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/mubivesamafejixanopida.pdf
    • https://cdn.shopify.com/s/files/1/0434/1389/7368/files/discord_code_tag.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_off000047e7.bin
3aea31a5176e71657664c11fece24f871dc092edef37a9fdeb3404f0afefb1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47E7 5288 bytes
font_01_sfnt_off000059da.bin
ec589fe4d40eaa4c14668fe1a39e81c7ac7438c9da4bf168aa3b0d54cf80e404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DA 10060 bytes

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