Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa7409d49398ed3…

MALICIOUS

PDF

40.6 KB Created: 2020-08-21 08:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91e8794fad3541f0edc1b599b28b4d4a SHA-1: 16c5383df527109510453443231c9a5553ed2ca0 SHA-256: 5fa7409d49398ed3ddc9fbcd752fc4a9cbe5b26349bdf00a77715734bdea6c23
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=about+me+essay+format, which is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for phishing or malware distribution.

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/pify?keyword=about+me+essay+format
    • http://supimap.inspireddesignsandmarketing.com/uploads/1/3/1/3/131381497/366115.pdf
    • http://files.floridacoalitionalliance.org/uploads/1/3/1/3/131379719/4fff55.pdf
    • http://bowuxo.fcsautomation.org/uploads/1/3/2/6/132680835/5a6870c8c014.pdf
    • http://files.roygrayphotography.co.uk/uploads/1/3/2/3/132302759/3755449.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/archinterior_39.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/20414885478.pdf
    • https://cdn.shopify.com/s/files/1/0433/8699/4855/files/top_100_songs_of_1977.pdf
    • https://cdn.shopify.com/s/files/1/0439/7917/8142/files/puvanetalig.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/basics_of_automobile_engineering_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5293/1995/files/jalemuvazo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/classical_beam_theory.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/71489845178.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/brain_teasers_puzzles_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/80666265033.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/rujewoki.pdf
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/93985552168.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/88047664388.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/22312043939.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/linuw.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_off00006322.bin
ca290fb2e0e1ddfa95180e35d15057595f634540f35934f0a40b9d58fe0de80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6322 5112 bytes
font_01_sfnt_off00007475.bin
ede1ee46b437ccaba769384c8803fc051f80e580d600c771df19c6ab0c3b69af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 9756 bytes

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