Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e77603dc8fb5dc…

MALICIOUS

PDF

48.3 KB Created: 2020-08-29 17:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2342df4826c84a6a37cdf796ad4ad4cb SHA-1: d9ebafd3f95aa6ccfca60d36e85f94b3af75e4eb SHA-256: c5e77603dc8fb5dca496f3320af1e28b40e2bc01f25fd7b7ed27796eeb5379fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a book title, aiming to trick users into clicking it. The ML classifier strongly indicated maliciousness. The presence of numerous external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. No scripts were extracted, limiting the analysis of direct payload execution.

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=starting+out+with+c+from+control+structures+to+objects%252C+9th+edition+in
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/vozitajowijinomumizaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4260/files/slow_hollows_atelophobia.pdf
    • https://cdn.shopify.com/s/files/1/0464/6597/4440/files/sedevegedorisivigad.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6428/files/vixojanazilavalulesobogo.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fbce7a65c8f45d1a6984650262bb083.pdf
    • https://static.usrfiles.com/ugd/b8c837_d843a90750ae4650b03735ca80350297.pdf
    • https://static.usrfiles.com/ugd/b8c837_2971500a16c6426c9a06f2667ab0b9e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_683867d6f6ab4a2c85a21c86e6755aee.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d97030adb904e1da4e1960c69db5cda.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_f9a4d82f97df47b98b6558ffce61cf12.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/paxave.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/31215283084.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/valve_actuating_mechanism.pdf
    • https://cdn.shopify.com/s/files/1/0430/3516/4835/files/sawudikazinobonebuvumide.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079fd.bin
05f656ea5a2a4c9a1a7311b4b79c5e65bf1dd3698996d6c636b47e521f81ec10
pdf-font-stream PDF embedded font (sfnt) at offset 0x79FD 6056 bytes
font_01_sfnt_off00008e7f.bin
396b78562ca301f316f3a0087ac55ef06bf7b3bb294f08dfaebc758a0a78469b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7F 10908 bytes