Malicious PDF — malware analysis report

Static analysis result for SHA-256 681cf38df5de1c61…

MALICIOUS

PDF

44.1 KB Created: 2020-08-01 06:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30b347f317dae601cb68db69cdecfc7f SHA-1: a19385194ac55c060ae0f9cb30badc0debc062fa SHA-256: 681cf38df5de1c610603574323b3c352db8d648ac756fe34a9784822593dfb79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including Shopify. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=ti+rubberband+man'. The presence of a link farm and a malicious redirector suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

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.cc/pify?keyword=ti+rubberband+man
    • http://files.doberunkennel.com/uploads/1/3/0/7/130739348/6635297.pdf
    • http://files.mainstreetenid.org/uploads/1/3/0/7/130776611/zokewelizot.pdf
    • http://files.gbpsu.org/uploads/1/3/0/8/130874474/siralabojo-novijodutu.pdf
    • http://files.crmoawareness5k.org/uploads/1/3/0/7/130739987/33912.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/piwojisujitudaxogon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/tuzedavebune.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/suturezalajowusuvogedalim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/nolemewetulopomudi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/rifilalafufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/11234057763.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/21432267893.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/52213819945.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/jevijaboba.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/zelefakobani.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/wukesaxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058b0.bin
b1a6e3e0b9a012273eb77c460a2636167e14b0af22f21926cd515aeec422f364		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B0 4544 bytes
font_01_sfnt_off000067e2.bin
765fd55f0ffdac802cb6459407cc55ce86001837cf87b29907499be9c9fe5cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 14760 bytes
font_02_sfnt_off000095b4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B4 4324 bytes

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