Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb9a3b132729379…

MALICIOUS

PDF

78.2 KB Created: 2020-07-09 21:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f50126865ad627f295dac5ac447dd508 SHA-1: c6065193e6a2c4895085e7353a491ecd439fc325 SHA-256: 7fb9a3b1327293796e926987a3a03cebbe600cff2cdfc7cd45991f6ea1eba3f4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=b.com%201st%20year%20question%20paper%202016%20pdf%20download'. The ML classifier strongly supports the malicious nature of this document.

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/wb?keyword=b.com%201st%20year%20question%20paper%202016%20pdf%20download
    • http://files.simonbarnesillustration.com/uploads/1/3/0/7/130776250/862ba9ae.pdf
    • http://files.copanelloentertainment.com/uploads/1/3/0/7/130738806/6839011.pdf
    • http://files.mayahabian.com/uploads/1/3/1/3/131398573/2858664.pdf
    • http://files.laurelschoolofdance.com/uploads/1/3/1/4/131483154/174860.pdf
    • http://files.coragulachouse.com/uploads/1/3/1/4/131438528/manoxobibususi.pdf
    • http://files.jaldridgephoto.com/uploads/1/3/1/4/131411411/9146998.pdf
    • http://files.bbluntsheabutter.shop/uploads/1/3/1/3/131383018/bajof.pdf
    • http://files.shizokukaratedo.com/uploads/1/3/1/6/131636852/9541914.pdf
    • http://files.framemysore.org/uploads/1/3/1/3/131384789/7349004.pdf
    • http://files.lauracathleen.com/uploads/1/3/0/7/130739328/1827369.pdf
    • http://files.lindaqphotography.com/uploads/1/3/0/8/130814076/xotofosemitijozil.pdf
    • https://robepeler.files.wordpress.com/2020/06/kinulofoweziwarotifuze.pdf
    • https://garuwade.files.wordpress.com/2020/06/nabojudawutijuk.pdf
    • https://bekakum.files.wordpress.com/2020/06/15196061853.pdf
    • https://gumuzodo.files.wordpress.com/2020/07/zirugugatonodas.pdf
    • https://vemupuki.files.wordpress.com/2020/07/397159413.pdf
    • https://kakakudob.files.wordpress.com/2020/06/pizuzajis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafitizeruzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevimija.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73930450062.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_off0000f2d5.bin
87c5fd7f5c562691db055a7d4538559febca134e6a90003648e61c20a9488331		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 6064 bytes
font_01_sfnt_off00010779.bin
522b7d6d4f4a38e067a6f61b9df49153686a7aff47f866bf6a02b7ec855f98ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 10436 bytes

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