Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dddb509435928ac…

MALICIOUS

PDF

59.6 KB Created: 2020-08-08 23:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d5aa597dd1757b5f7e9d68c2800c23 SHA-1: 304a2d715bb9c3468ea25436322a8961ce5fbda8 SHA-256: 3dddb509435928aceecda707efd527dbc572825802d7c291dfb75aece4750c3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=bendix+quick+reference+catalog+pdf', suggesting a lure to download further content or redirect to a malicious site. The presence of a link farm further supports the malicious intent.

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.ru/pify?keyword=bendix+quick+reference+catalog+pdf
    • http://files.foryourdogsonly.com/uploads/1/3/1/3/131382239/5070544.pdf
    • http://files.saramapellibeequeen.com/uploads/1/3/2/6/132695832/ee286b4.pdf
    • http://files.ruthscheuing.com/uploads/1/3/0/7/130775503/gaxudu.pdf
    • http://files.kenleighsfiberstudio.com/uploads/1/3/1/0/131070753/davidowudam-ramoxej.pdf
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/81545286753.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9562/files/23460544520.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/wiwim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/lorasikimabikuxum.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/nasegunimumonexisibuxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/xitimabujirisiladipige.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/epigenetica_livro.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/nigugire.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7046/files/vexivuxibepetavofajuvi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/jotit.pdf
    • https://cdn.shopify.com/s/files/1/0437/8758/3650/files/sitav.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/felep.pdf
    • https://cdn.shopify.com/s/files/1/0438/2746/2301/files/country_code_94.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fda.bin
dedf4276a789478706690c5e24a9db9ebafedaef0fa13b541327130b06313776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDA 5452 bytes
font_01_sfnt_off0000b27d.bin
549410b452766baa6a4b71f73d1b0bd385f22643499d9ecdaccfda126a8a9b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 15260 bytes

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