Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b16dd4fd3432cf1…

MALICIOUS

PDF

40.5 KB Created: 2020-08-20 03:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a65ad728a232f2e8c1fb95cec282e7 SHA-1: a6d6d25e55d5b79330eea5a71220ff8d4a47826e SHA-256: 5b16dd4fd3432cf1660e565327bb4c32bea922d123df39f522c22f9b85580bea
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm designed to obscure the malicious redirector.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=business+folder+template+psd
    • http://supexez.europeanmasterswl.com/uploads/1/3/2/6/132681862/2699431.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/que_es_riesgo_relativo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/96166894115.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/2nf_vs_3nf.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/brute_lawn_mower.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/82139659946.pdf
    • https://cdn.shopify.com/s/files/1/0432/9757/0980/files/jovot.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/springboard_algebra_2_unit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5023/7085/files/gezodojetofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/lobozigiminap.pdf
    • https://cdn.shopify.com/s/files/1/0429/6753/1673/files/25417720156.pdf
    • https://cdn.shopify.com/s/files/1/0430/0754/1401/files/gebonegotavepafevela.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8042/files/pifukozawupotaf.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_off00006063.bin
6495b4dbad0b191c35d4221b8f8c1b1bc03d68f68adc8a1ed59bec2b9c1ed190
pdf-font-stream PDF embedded font (sfnt) at offset 0x6063 5236 bytes
font_01_sfnt_off00007210.bin
8ac6cb5703eb1fa4b1c75f37d49f099210445b7eb174733a851e877e8ace9fdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7210 10352 bytes