Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22425387065ed1d…

MALICIOUS

PDF

43.0 KB Created: 2020-08-13 21:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e41e40b9914e4e8df9fc151b40a97258 SHA-1: cee15b4986213d930488b1a8276bc5c75bf612fd SHA-256: a22425387065ed1ddd7b31bec551fbce1d2d6733fbd6d752210168d281d9bf82
154 Risk Score

Malware Insights

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

The PDF contains a lure text related to a 'child care leave application' and embeds numerous external links. One of these links, `https://ttraff.ru/pify?keyword=child+care+leave+application+pdf`, is flagged as a malicious redirector. The PDF also exhibits characteristics of a link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicates 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/pify?keyword=child+care+leave+application+pdf
    • http://files.danielleportfolio.com/uploads/1/3/0/9/130969545/guliromidalagixo.pdf
    • http://jiwazut.vascularheartandlung.com/uploads/1/3/0/7/130739553/bafizado.pdf
    • http://jasotewe.cherylreed.net/uploads/1/3/1/0/131070109/dofiwaw_mokanelebegul_xutovoparam_kelinakujoge.pdf
    • https://cdn.shopify.com/s/files/1/0449/0670/9159/files/briar_rabbit_y_tar_baby.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/barugunewosisud.pdf
    • https://cdn.shopify.com/s/files/1/0451/0954/3077/files/tablaturas_de_canciones_faciles_para_guitarra_acustica.pdf
    • https://cdn.shopify.com/s/files/1/0440/9635/6504/files/58535949363.pdf
    • https://cdn.shopify.com/s/files/1/0438/6871/7216/files/93_civic_hatchback.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/detakof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/gomosigujixepagarabarof.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/caterpillar_front_end_loader.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/kominedaralibaxagumip.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/wakexodigomebaguj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/jigufofijaxoxobonejofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7737/files/concentric_zone_theory_by_burgess.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/82538281271.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_off00005ce6.bin
4bf1191d5b0ab882f98b01eca0f74e49670b4f458e39fb4807b03870e8c252d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE6 4936 bytes
font_01_sfnt_off00006da8.bin
6add568d942c0b8dc0b28a007dc3f290eb784466590b4f767f5a75a8c4a82cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA8 10440 bytes
font_02_sfnt_off0000911b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x911B 4324 bytes

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