Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e530100a7fa26ef…

MALICIOUS

PDF

44.1 KB Created: 2020-08-05 04:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c706c06d6b7d79143cfa61ee76fc40ef SHA-1: 0238c6d673f5974f6b5b20db28a9b635a32ca88d SHA-256: 0e530100a7fa26ef556861170595f4fb63d1ce9bf4735b67fe78a75814bebfba
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains a reference to 'drdo answer key pdf' and the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to attract victims. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=drdo+answer+key+pdf
    • http://nupatogi.farmandranchdogs.com/uploads/1/3/0/7/130738870/jexexilisozipo-maletefegowedi-mifudujizirakob.pdf
    • http://files.flohtoronto.com/uploads/1/3/0/8/130813762/b5cceaf9739feb.pdf
    • http://files.fossilschools.com/uploads/1/3/1/8/131871494/joxup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/towogenugozezuraj.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/biwalilevarutigarejovet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0663/1846/files/dezudexaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3366/files/5.pdf
    • https://cdn.shopify.com/s/files/1/0431/8956/7650/files/fufipipatulipotewoboto.pdf
    • https://cdn.shopify.com/s/files/1/0438/3123/0614/files/ibanez_serial_number.pdf
    • https://cdn.shopify.com/s/files/1/0437/1136/5288/files/pravana_color_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/posonisopunusamuzotiwevop.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/spanish_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1819/files/lodatuporog.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/sijoguwunuxipatevopivod.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/2012_ford_focus_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8078/files/gamusujevebozazad.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/85545977172.pdf
    • https://cdn.shopify.com/s/files/1/0435/8301/3023/files/mezzo_forte_definition.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_off00006ad7.bin
4781cdbc796f7f502820696a4e60a5874a26d847a43b8e015693f3d59ca5aa37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD7 5260 bytes
font_01_sfnt_off00007cee.bin
9a9d79719b05c055870536d2768e56df942bb9baed5f938b5cf643dd93306c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEE 11776 bytes

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