Malicious PDF — malware analysis report

Static analysis result for SHA-256 73108ca4967308cc…

MALICIOUS

PDF

43.4 KB Created: 2020-08-22 11:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cae96067f91a41253ad1f09a9e54b971 SHA-1: 5335a72048d08a8da57297a8139257ba7ca53ed9 SHA-256: 73108ca4967308cc5de996085453b5c191d74ad46a0c62647a6618e46da97e59
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, forming a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=screenshot+app+for+windows'. The 'SE_CLICKFIX' heuristic suggests the document may instruct users to execute commands, a common social engineering tactic to bypass security measures. No scripts were extracted, but the overall structure and malicious redirector link strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/pify?keyword=screenshot+app+for+windows
    • http://biredasuv.britishwhaling.org/uploads/1/3/1/4/131452841/62256ae10ca250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5139/1907/files/zalifotud.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/tokotonexubarujazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1278/files/baron_psychology_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/raxewijukikemomusonubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/algebra_1_florida_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/rosonojakukoliner.pdf
    • https://cdn.shopify.com/s/files/1/0441/1500/1496/files/vedizizazafixobujevi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/85732425099.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/zobib.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/championship_manager_93.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0431/2091/8679/files/psychology_in_bengali_free_download.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_off00006b1a.bin
b1b1e08f1fd8c81d385f07a0b1382bd5fb71f4c453ec4894c2b382bbb8606f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1A 5404 bytes
font_01_sfnt_off00007d77.bin
e92265d6a507669bfa54aea07de8a630ab0d9801f3866417a0fa36316754e27e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D77 10280 bytes

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