Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c94e0e64929f7ed…

MALICIOUS

PDF

47.8 KB Created: 2020-08-14 10:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef7a6d0f47c7e5e803bef8743139db33 SHA-1: 9044a438fc7ad898f7d0f2e034a9cebfd2fdf81c SHA-256: 9c94e0e64929f7ed7e4227aea209337e3f8edb8ce81d75b3c1710dc98d9ba771
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a large number of embedded URLs, including a suspicious redirector at 'https://ttraff.ru/pify?keyword=beckhoff+ipc+performance' and numerous links hosted on Shopify, likely part of a link farm to distribute traffic or host malicious content.

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=beckhoff+ipc+performance
    • http://gagedi.woodcraftguildtasmaniainc.com/uploads/1/3/1/6/131636644/ruzijemefototi-wofuko-negokuni-xowenugogi.pdf
    • http://files.lifewithtoribrand.com/uploads/1/3/0/8/130874317/fapetuvi.pdf
    • http://files.marykmurphyart.com/uploads/1/3/0/7/130739294/kidabiteso.pdf
    • http://files.christinamascarenas.com/uploads/1/3/1/0/131070207/pebonokekesizi.pdf
    • http://files.josezayaspr.com/uploads/1/3/0/7/130739951/lexerejibube.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/cambridge_primary_english_activity_book_stage_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/gaxinesotureniserorabox.pdf
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/cloridrato_de_cetamina_bula.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/94514160455.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/xexazivotalezikuwezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/nuxaxeredabetiweriki.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7431/files/cirrosis_hepatica_tratamiento_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/2506/2298/files/vorapilasaxidi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9336/7710/files/39167843393.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/budget_sheet_printable.pdf
    • https://cdn.shopify.com/s/files/1/0431/8730/6658/files/computer_capsule_for_nabard.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/host_files_in_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/12421995433.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_off000073e0.bin
e8757c3819b69763f813262d260863f61986d790ef09397e9f56c15834731074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E0 5160 bytes
font_01_sfnt_off00008540.bin
6e5528747295ecbca4e810fed5eecfbd3323feed6d6c94de17c028aefc720404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8540 14280 bytes

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