Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c3c73f0948029f…

MALICIOUS

PDF

54.3 KB Created: 2020-08-21 17:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c293f5ce41df00cf5d00179efa2247 SHA-1: e00a024f3c357b92e203136e8f79107bf951fad0 SHA-256: 66c3c73f0948029f6e9aa273ef3c9540a233997398656fe50c13876d6fd5671c
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL and text related to removing an 'Android browser hijacker', indicating a phishing or scam attempt. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm used to obscure the malicious destination.

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=android+browser+hijacker+entfernen
    • http://xibonojij.nfpb.org/uploads/1/3/1/3/131398404/xozugewo_zikaluv.pdf
    • http://wutar.alrabiahtrading.com/uploads/1/3/0/7/130739227/6718895.pdf
    • http://files.harrypottervet.com/uploads/1/3/1/8/131856666/pabilokipefe_fadodo_limigipilovitir.pdf
    • http://files.mauraflaherty.com/uploads/1/3/0/7/130740124/pelutinakediwa.pdf
    • http://files.hiddenfocus.com/uploads/1/3/0/8/130813395/zekozilibewese-mulutef-relonibumosum-mukemomotipufuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/kexowakavakalige.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/86072050446.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/sheridan_flannelette_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/setebivebogona.pdf
    • https://cdn.shopify.com/s/files/1/0428/8361/2831/files/20846949590.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/zuler.pdf
    • https://cdn.shopify.com/s/files/1/0451/1091/9321/files/o_corvo_edgar_allan_poe_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0433/5593/0783/files/7664683219.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/all_cyberlife_androids.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3605/files/ncaa_basketball_scores_espn_mobile.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_off00008586.bin
fb74375b3ac20c5341726bb82ea451c958b3ed968853230d70aaf7e24668d5a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8586 5224 bytes
font_01_sfnt_off00009748.bin
362820d4360751e8b609ca7b0861ed400b886cf041670870e948071f1938fc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9748 11272 bytes
font_02_sfnt_off0000bc31.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 4324 bytes

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