Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b9aaace7c1ad48…

MALICIOUS

PDF

37.2 KB Created: 2020-08-16 18:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6be63597ec4257421e62a352233ba670 SHA-1: 1fb1d4b5f7b961c68d3e3731330fa1147a891cc7 SHA-256: 16b9aaace7c1ad480485ca6395966c208608752078c3fc74ea6cb6c2b143a124
154 Risk Score

Malware Insights

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

The PDF contains embedded links disguised as financial aid forms, with one primary link identified as a malicious redirector. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, and it also contains a large number of external links, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, but the presence of malicious links and the overall structure strongly suggest a phishing or redirection attempt.

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.com/pify?keyword=brazosport+college+financial+aid+forms
    • http://files.jeffgoldsteinattuner.com/uploads/1/3/1/3/131384797/6e4f394c.pdf
    • http://files.susurrostudio.com/uploads/1/3/1/4/131454102/dotevukoxuzavad.pdf
    • http://retujarev.classictrimming.net/uploads/1/3/2/6/132683438/1d5d94b.pdf
    • http://files.jodiemarvincreations.com/uploads/1/3/0/9/130969418/pemaluw.pdf
    • http://gusixefo.friendsofsola.org.uk/uploads/1/3/0/9/130969744/rogimifuke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/kekevatefobiwudoxonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/lewenojirajoxojojexusil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/1970118184.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/7818419087.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9576/files/peveruzefukironinezimeviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/nonibad.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6063/files/72463248335.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3945/files/63084513366.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/babcock_university_school_fees.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/46972283885.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/22458050770.pdf
    • https://cdn.shopify.com/s/files/1/0447/4670/2999/files/fifabi.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_off00005228.bin
a95c4ec2bbf93080fab617a1c3d75980d780473fa15c29facf36846555c1532d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5228 5572 bytes
font_01_sfnt_off0000650e.bin
3bc9d91d6bd32dee26f06b0a6e63228ad242eb899c3c8396e4d4e77d3c49f2b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650E 10208 bytes

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