Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c4341571489432…

MALICIOUS

PDF

38.3 KB Created: 2020-09-13 00:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 803a9a3d4e8bbe3ecbc145416239a023 SHA-1: f21fa032ee2ef46af2fb2172a6866124fe6d4f99 SHA-256: 88c4341571489432a30b9290e8b7bba787cef1062a4d56d6830626669639f10e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.me'. The document body, though heavily obfuscated, contains this URL and a reference to 'unblocked games', suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, some of which are benign but others are part of the malicious infrastructure. No scripts were extracted, but the presence of a malicious redirector indicates an attempt to lead the user to a harmful site, likely for further exploitation or phishing.

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.me/wix?keyword=run+3+24h+unblocked+games
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/40149334680.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/aircraft_engine_instruments.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/31111549412.pdf
    • https://static.usrfiles.com/ugd/b28561_d36bffcba67d451792bdbad8edf12b51.pdf
    • https://static.usrfiles.com/ugd/7d21c0_16f2fb1e20af42ad9473af394a0277d0.pdf
    • https://static.usrfiles.com/ugd/d5cf39_39a00a5943e54f24bc2575001c6b8682.pdf
    • https://static.usrfiles.com/ugd/28b3f7_dabc474d5af44d1ea419206fe8864830.pdf
    • https://static.usrfiles.com/ugd/8127dd_2328acf2aa894d67b358eb23d1631909.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/palmistry_lines_and_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/zomigutogowumipodo.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ee411929aed468eaa0a2edda25113f1.pdf
    • https://static.usrfiles.com/ugd/53c654_c9e22b7aa3c2444495ff7adf3c5c4759.pdf
    • https://static.usrfiles.com/ugd/227d0f_1a09352558e742afadc7c1593afa415c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a67.bin
01f8c03b43c66ecba3908a1d7ca174067bbe97221143b9942cc43f3289cb2f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A67 5608 bytes
font_01_sfnt_off00005d41.bin
461f5d59dc3bfdb71fa7936cb3780166fc3a08e7b31da74ff49bb19d6e9180c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D41 9708 bytes
font_02_sfnt_off00007e3b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3B 4324 bytes

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