Malicious PDF — malware analysis report

Static analysis result for SHA-256 118df133385bf501…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 11:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2517cf90ab927330b5c90515c3757a4e SHA-1: 2f9d9b991adb2a5c550e33b89ccc917e1fbe1d79 SHA-256: 118df133385bf501fca2bdd8db7083e3a4a670a8e95373bbee802c990b9198b2
154 Risk Score

Malware Insights

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

The PDF contains a lure for a bursary application, but the embedded link redirects to a malicious redirector. The document also hosts a large number of external PDF links, likely for SEO manipulation or to obscure malicious activity. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead the user to harmful content.

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=motivation+letter+for+bursary+pdf
    • http://files.arthealswarwounds.com/uploads/1/3/0/9/130969158/tokibafaninakip.pdf
    • http://vodadum.morganluttig.com/uploads/1/3/0/7/130738615/xinewa-xexatop-womowe.pdf
    • http://files.jlraskin.net/uploads/1/3/1/8/131871849/rukim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/99564069599.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/63178535561.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/94016816789.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/hentai_yaoi_manga.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4734/files/josexenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/75108738689.pdf
    • https://cdn.shopify.com/s/files/1/0437/9249/8850/files/git_permission_denied_publickey.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/49907346094.pdf
    • https://cdn.shopify.com/s/files/1/0434/8474/1798/files/37537209667.pdf
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/bokelupuzonavimedove.pdf
    • https://cdn.shopify.com/s/files/1/0448/6879/6578/files/bpo_quality_analyst_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/41100630416.pdf
    • https://cdn.shopify.com/s/files/1/0445/5153/6799/files/how_to_make_cold_in_little_alchemy.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_off000055e0.bin
68fe4d58e0d4a95e2991d95b972c2fc750d7bf933323e6c5c1df464982d04a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55E0 5344 bytes
font_01_sfnt_off0000682e.bin
d8300a16d6ad9cce08696ec9cfb8ed8da65abaa7cc19181f152944ebb31ae091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 15468 bytes

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