Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a584ce9053b0c6…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 12:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 505a27ee5dbcaebc2a007d1603abcabc SHA-1: d87923ceaf553f71133a7345beab9b80697d5113 SHA-256: 05a584ce9053b0c6825101ec50dc0cf0c98a9ef1a89a4521453a9f061f622610
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wb?keyword=epub%20to%20pdf%20converter%20online%20zamzar'. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious sites. 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/wb?keyword=epub%20to%20pdf%20converter%20online%20zamzar
    • http://files.en.todaysteachingtools.com/uploads/1/3/0/8/130813747/gixilowoxugu-xirenepi.pdf
    • http://jediv.rewoca.org/uploads/1/3/1/4/131407089/6824385.pdf
    • http://files.rone.studio/uploads/1/3/2/3/132303351/pidap-fusukuv.pdf
    • http://files.uuyacj.org/uploads/1/3/1/3/131384289/jefirogu-pidij-nivinamafefugu.pdf
    • http://files.ncwknittersguild.com/uploads/1/3/2/7/132740285/9569781.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/joriken.pdf
    • https://cdn.shopify.com/s/files/1/0447/8582/7991/files/batman_hush_comic_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0446/2074/2819/files/bixajex.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/masojaranaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/42080016933.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/kisomixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/larunezedokap.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/13719486362.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/77855900224.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/rurunuvinugeboneke.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/radamasake.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/53924709855.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/weighted_average_cost_of_capital_notes.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_off00006555.bin
cf7f8317e24dd47b91e08e33b604360a69a926fd9e29fb9cde1928125786ea57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 5328 bytes
font_01_sfnt_off00007763.bin
cd9883f438a6feffef55c53021b4ae5b51c993bae0a664657faf65c1c42cfd4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7763 10424 bytes

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