Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12a758ae2646cdb…

MALICIOUS

PDF

44.4 KB Created: 2020-08-14 22:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb440d971acdfcd051b7391146f9a225 SHA-1: 2e87c015d1dc4cb40f9e9d76b6eca2d9c27878a1 SHA-256: c12a758ae2646cdbad3dbaedd9700c40d8bf4855706b3b9c658dc0081963151d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link to `https://ttraff.ru/pify?keyword=sky+deutschland+tv+guide+app` is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Sky Deutschland TV Guide App', suggesting a lure to trick users into clicking the malicious link. 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=sky+deutschland+tv+guide+app
    • http://files.kenyonbuilding.com/uploads/1/3/0/7/130739225/salimoresapu_fovidako_daguzidowev.pdf
    • http://juvelota.morsecodedesigns.com/uploads/1/3/1/4/131438379/8651397.pdf
    • http://files.plumcreekownersassociation.com/uploads/1/3/0/8/130874667/2865719.pdf
    • http://files.otvfc.com/uploads/1/3/0/8/130874058/zijeniz.pdf
    • http://files.gratefulglass.net/uploads/1/3/1/3/131398475/32fe922.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/firotitolujiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/vapukirizawedekuto.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4487/files/translation_reflection_rotation_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/74489180344.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/rick_astley_whenever_you_need_somebody.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/46241097806.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/dalikawofur.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/66507620608.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4454/files/total_gym_platinum_plus.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/zekuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4818/8569/files/lutobe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4984/files/backshift_of_tenses_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/pujamulinupam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b99.bin
2553e337ac7031d20fc037efff1b68f2a3b5493e34bc058007c2dfcac3695acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B99 5568 bytes
font_01_sfnt_off00006e96.bin
43dc8c004dd3c21db5630df6e684639d067c2483b4cc68431ead51ba9689a02d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E96 9536 bytes
font_02_sfnt_off00008f62.bin
a8b3175009038fd0b36d272851454f9fd5e73b9a70874fb4018b32218f75eaa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F62 16092 bytes

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