Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cffbac208f43709…

MALICIOUS

PDF

48.6 KB Created: 2020-08-24 10:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a478b03c815bb559488a3b87b2d3a46 SHA-1: 75f00fec5baad1f67fc5dfbd0473c5d4cdd74389 SHA-256: 3cffbac208f4370992a173b20583da60e6bd90cd44cf89276b54297aa06d5efa
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=formal+complaint+letter+template+pdf, suggesting a lure to a phishing or malware distribution site. The presence of many external PDF links also indicates a link farm, likely for SEO manipulation or to host further malicious content.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=formal+complaint+letter+template+pdf
    • http://files.coyotekidz.com/uploads/1/3/2/7/132710671/wirolavoritetezajova.pdf
    • http://files.tommyreddicks.com/uploads/1/3/2/7/132740723/feviwapu_muwete_gukixadazel_loxemufi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1538/7811/files/26094324065.pdf
    • https://cdn.shopify.com/s/files/1/0432/1404/5341/files/nisulewasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4311/8495/files/acrobat_reader_for_windows_8_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/93021701016.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/84367772774.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1277/files/chahat_full_movie_shahrukh_khan.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8022/files/99803995125.pdf
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/53228000159.pdf
    • https://cdn.shopify.com/s/files/1/0436/2980/5726/files/98379061671.pdf
    • https://cdn.shopify.com/s/files/1/0448/3383/3122/files/differential_calculus_bsc.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3014/files/togujimuzapibusuwiwuwekel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/nirejamivomiw.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_off000080c1.bin
14a3a1b4bb386902f97e55f013bf5535232d2cfaeec127abd8ed9d5780c6867d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C1 5080 bytes
font_01_sfnt_off000091ed.bin
528704899300135a73a6597bfb75c0131c264daa796054c7ff2370fa4d303ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91ED 10612 bytes

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