Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b37fd5af7036d09…

MALICIOUS

PDF

49.4 KB Created: 2020-08-28 08:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb8ea0587bf0ac8b9dc693c5cc62331 SHA-1: cb60fb8c4a15235937605f2c5bd17dd7f3efeeb4 SHA-256: 9b37fd5af7036d09c63e692f5e3b4dc38584c02fd3bd0bd6892815501d98b026
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic firing. The primary malicious URL is 'https://ttraff.com/pify?keyword=nshm+kolkata+course+fee'. The document body, though partially corrupted, contains text related to the URL's keyword, suggesting a lure. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=nshm+kolkata+course+fee
    • http://mizadab.llhsa.org/uploads/1/3/1/0/131070387/vukabe-madomewozedezid-voserabonaz-wofep.pdf
    • http://files.mail.byboukje.nl/uploads/1/3/2/7/132741020/sukopivugopugobuxosa.pdf
    • http://mikolu.seelenleben.ch/uploads/1/3/1/4/131453540/pudego-wukabawexusog.pdf
    • http://files.booksthatbalance.org/uploads/1/3/0/7/130775628/bifajagixin_sulomo_timeza_ruleba.pdf
    • http://mebulafu.zhouzoeyuan.com/uploads/1/3/2/7/132712207/bugovefubi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/43673240282.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/mapa_politico_centroamerica.pdf
    • https://cdn.shopify.com/s/files/1/0437/4206/8887/files/56058759029.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/boronuvixipanosuvazowunef.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/45304729764.pdf
    • https://cdn.shopify.com/s/files/1/0432/9573/5976/files/ganpati_atharvashirsha_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/revukimiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4618/2822/files/33316433079.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/sutifinekugixekovoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/44881406796.pdf
    • https://cdn.shopify.com/s/files/1/0462/3066/7413/files/movil.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/77117328265.pdf
    • https://cdn.shopify.com/s/files/1/0459/1658/6133/files/bonfiglioli_gear_motor_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0432/2043/5112/files/microsoft_brand_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/definicion_de_amigos.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_off00007787.bin
566571496a093dd72e2e91914278c1fed4a57866bb602942f3a15324933353c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7787 5152 bytes
font_01_sfnt_off000088ea.bin
a7688c69b1c3c96a466fb4b22b9691670754c469d22bfd877b1df9b6a50a4799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88EA 15024 bytes

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