Malicious PDF — malware analysis report

Static analysis result for SHA-256 151476e852be3569…

MALICIOUS

PDF

47.5 KB Created: 2020-08-05 22:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4622bce353d88db34602e4c55a0ef9c SHA-1: 7205e74c1c0e87342ae1613adb4152644fc52033 SHA-256: 151476e852be356914a3fa2e986d58c368fb781e69e130093f1ec1219b595354
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains a URL that matches the redirector link. The presence of a large number of external PDF links suggests a link farm, likely intended to manipulate search engine results or distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=approximation+questions+for+ibps+po+2020+pdf
    • http://files.hannahbettsphotography.com/uploads/1/3/0/7/130739116/b3a6ff71.pdf
    • http://files.maisonmiroir.com/uploads/1/3/1/4/131437766/kupivitunabemo.pdf
    • http://files.raserabwehr.de/uploads/1/3/0/9/130969879/621d8af8ceac1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/vim_replace_with_new_line.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/faditepigematok.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/91977516702.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/radiwaso.pdf
    • https://cdn.shopify.com/s/files/1/0428/8308/8547/files/xitafavajizuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0932/files/xukelub.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/almidon_en_coprologico.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/konajenepurevevarozat.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/gatule.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/40526734820.pdf
    • https://cdn.shopify.com/s/files/1/0436/0932/5730/files/rezewupowugedagajaderawo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/mimukixofixajulodu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/oscar_peterson_hallelujah_time.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006403.bin
095464465ba3d8fc2ca1549031d1a51d73508195fb3a183b89f2db6a68f6a484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6403 5632 bytes
font_01_sfnt_off000076fc.bin
8a7fef30536efc43730865987e3b75d47a259a08003b22921e980fc4baa691d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FC 1728 bytes
font_02_sfnt_off00007f97.bin
cd7b1cba73983a3890e079f71c5be643185271c4a5a6515a9cf99db7d89fe6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F97 10108 bytes
font_03_sfnt_off0000a1dc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1DC 4324 bytes

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