Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf020ad83550e97…

MALICIOUS

PDF

34.0 KB Created: 2020-08-18 15:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65de23286ba81b390fc72be2d24ee3de SHA-1: 64672a47864e6f7f2e1d1252912507b2b3a8166c SHA-256: 5cf020ad83550e97ed835e1a2d92207fd4879719bb1039f58e8d7dac58feddc4
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 link farm designed to host malicious content. One prominent URL, 'https://ttraff.ru/pify?keyword=pakistani+bridal+images+free', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting a lure to trick users into clicking through to malicious sites. The ML classifier also strongly indicated maliciousness.

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=pakistani+bridal+images+free
    • http://lozuwi.thedjbsmooth.com/uploads/1/3/1/8/131856476/levasakiw_zekuketapu.pdf
    • http://files.jejureads.com/uploads/1/3/0/7/130775635/761acf.pdf
    • http://files.canaseragafestival.com/uploads/1/3/0/8/130874431/1572868.pdf
    • http://fanijake.jecreativity.com/uploads/1/3/2/8/132814930/4013980.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9696/5269/files/didis.pdf
    • https://cdn.shopify.com/s/files/1/0436/4170/0505/files/janevexinamejir.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/98872210255.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/76528516659.pdf
    • https://cdn.shopify.com/s/files/1/0432/9016/5403/files/98236152031.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/raised_by_wolves_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0450/3542/1846/files/lord_of_the_rings_concerning_hobbits_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/48864168600.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7451/files/kuvuxew.pdf
    • https://cdn.shopify.com/s/files/1/0436/0513/1421/files/zematenuluwafomumokatufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/xefitu.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_off00004038.bin
76e06a0f400dc355457547dc298f44831928f329cb5c66656ff6e10b187c1823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4038 5108 bytes
font_01_sfnt_off00005168.bin
c76fdbdb074e5c3fa326f5b7033d510a7ad47b6df4d9ec7a517c83bfc5a67c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5168 8148 bytes
font_02_sfnt_off00006d1d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1D 4324 bytes

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