Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f549aed2e391955…

MALICIOUS

PDF

142.9 KB Created: 2020-07-11 08:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3913108903bb141817e7f6a4c6b0c9b SHA-1: 0db79fa45600a01c0854c95a45e9d64cf63a5675 SHA-256: 9f549aed2e39195547c3a803137569adbe2fd34514db332717f6806bf8545bc0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=table+alphabeticall+pdf'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=table+alphabeticall+pdf
    • http://files.balloontwistersdcvamd.com/uploads/1/3/0/9/130969375/gipagazovupibiz_tolokaduwimola.pdf
    • http://files.lynnkirkham.net/uploads/1/3/0/8/130874318/6548217.pdf
    • http://files.stitchedwithcare.com/uploads/1/3/1/3/131383624/dowumi-wefudazebukop-wivavin-tajewowe.pdf
    • http://files.tedatkinson.com/uploads/1/3/0/8/130874641/disob.pdf
    • http://files.rachaelcarrcounseling.com/uploads/1/3/1/3/131398084/puvopaji.pdf
    • http://files.millbrookrotarydirectory.com/uploads/1/3/0/7/130775846/d99ea.pdf
    • http://files.dakotarosefloral.org/uploads/1/3/0/7/130776249/e65b91ae4c3.pdf
    • http://files.keirablackwood.com/uploads/1/3/0/7/130739131/gosixuruxeve_nasenonijoba_nibaranokusine_jomuzeluxabe.pdf
    • http://files.miltonmurray.org/uploads/1/3/1/6/131606644/nelemilor.pdf
    • http://files.largolimousineservice.com/uploads/1/3/1/3/131398279/034e672002b1.pdf
    • http://files.roysecityhomeschoolacademy.org/uploads/1/3/0/9/130969154/gipusa.pdf
    • https://wixujeki.files.wordpress.com/2020/07/81618294746.pdf
    • https://ribekewozepu.files.wordpress.com/2020/06/82877028034.pdf
    • https://julaxotetelu73207895.files.wordpress.com/2020/06/lulagitunezug.pdf
    • https://fazabile.files.wordpress.com/2020/07/rusawomofadapa.pdf
    • https://lawivomeru.files.wordpress.com/2020/06/51001506999.pdf
    • https://wubizidaxiw.files.wordpress.com/2020/07/41530116478.pdf
    • https://mutebiduv.files.wordpress.com/2020/07/94054373212.pdf
    • https://cdn.shopify.com/s/files/1/0428/1047/4663/files/59400904777.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/43121104476.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/8913043926.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/77817211748.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/jekirulomakowodakometogid.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_off0001f9dd.bin
6befc7e7f6ab4f1de15a6c0292de4a0e30a341c0f81d0fa8d09eb8ee9ea248d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9DD 4632 bytes
font_01_sfnt_off000209a4.bin
a8fc4fb71129c2f3c7964e66733a75bd84763623b9041630dde8ea442a967e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x209A4 10688 bytes

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