Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3781bfa2c968460…

MALICIOUS

PDF

42.6 KB Created: 2020-08-03 02:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1926607d1c29eadc5b6dd9961ca22d59 SHA-1: f0544f739f9edd32dd3e583dc741f6495b86ad3b SHA-256: e3781bfa2c9684607cea4a41018424a30d5b42eafc01799a2f7ef8357c6bf4fb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with the primary redirector URL being https://ttraff.ru/pify?keyword=programming+the+world+wide+web+sebesta+pdf. This URL is flagged as malicious and is part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to download potentially harmful files disguised as legitimate documents.

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=programming+the+world+wide+web+sebesta+pdf
    • http://files.marcello-messina.com/uploads/1/3/1/4/131406149/rugusasirul.pdf
    • http://files.vintagewoodworkingtools.net/uploads/1/3/0/7/130740625/siwisap-sawew-vepuro.pdf
    • http://files.atatournament.com/uploads/1/3/2/6/132682833/a8a7169b81.pdf
    • http://files.ultraufitness.com/uploads/1/3/0/7/130775471/bolivopefusi.pdf
    • http://files.bethelchurchofchrist.org/uploads/1/3/1/3/131398244/3470c84bf7f.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/58896547670.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/giverawudep.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/1991532473.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/36892129349.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/toxekuxosojodesuxisesope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7350/files/3785796770.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/52211517221.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tokisesuzarutaxiwiru.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8115/files/18183660663.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3641/files/27412301228.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/wasted_years_tab.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_off0000599e.bin
61f3a66735278df733544d90312ab847e7e13c1d0463fab9a65450d3d144ae41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x599E 5476 bytes
font_01_sfnt_off00006c0c.bin
9bc1765b9fd4c3780e2330f904c2b1923cec692b28e16fc161429f42d1856d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0C 10228 bytes
font_02_sfnt_off00008efe.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFE 4324 bytes

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