Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfbea71acffd5d1…

MALICIOUS

PDF

57.7 KB Created: 2020-08-11 05:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6affb2d01df32f4ee4d24e3fe7ea006 SHA-1: f79f41e042eaee39d1044cdcfa1c866d3ebe4e38 SHA-256: dbfbea71acffd5d1c5ba3e20a7806f4edbf208fe0207bac476cd3a49585b8b48
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded URLs, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure (ttraff.ru). The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be the distribution of malicious content or SEO manipulation through a large collection of PDFs.

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=anandamayi+ma+pdf+italiano
    • http://files.livelikeme.info/uploads/1/3/1/8/131856100/d8711dc04d.pdf
    • http://vewukod.meikeourvillagehall.com/uploads/1/3/1/0/131070420/semajezab.pdf
    • http://files.masksandmoreus.com/uploads/1/3/1/4/131482941/zoxujabopavovow_lefejasajova_muwuniduwanenu.pdf
    • http://files.stephaniemeredithart.com/uploads/1/3/2/8/132814949/jasidagizo.pdf
    • http://files.rachaelerrington.com/uploads/1/3/0/9/130969699/dc519f6c482.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/dovoxizuxufogutefekux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/barupulalalodiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/lowes_ogdensburg_ny.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/xobegozabasidevenoritan.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/wopalefefijulesije.pdf
    • https://cdn.shopify.com/s/files/1/0431/4749/3536/files/jatebogalujaviximejuloga.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4843/files/besusaba.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/vijudufezotejazeze.pdf
    • https://cdn.shopify.com/s/files/1/0436/4215/9257/files/interventional_cardiology_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/37585138101.pdf
    • https://cdn.shopify.com/s/files/1/0435/1416/7450/files/k_michelle_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9275/files/equidad_de_genero_en_el_peru.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008350.bin
9aa5dc40208a1f012ea404e05bbcccaac24d11159b06bc71e650a5564c0b2af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8350 4676 bytes
font_01_sfnt_off00009317.bin
cbd211172ea3c1f3ebee3bbf9de37ed72a96978603451c8de0c952c238aa50a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9317 5784 bytes
font_02_sfnt_off0000a617.bin
39f4aad4473634093cc9ef2eaac3e5d093c4943e8e4d697971b36152775e53ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA617 10412 bytes
font_03_sfnt_off0000c93a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 4324 bytes

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