Malicious PDF — malware analysis report

Static analysis result for SHA-256 16be90e51bf8a50e…

MALICIOUS

PDF

34.5 KB Created: 2020-08-06 13:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3d46c853cf664698d3ede301647b07d SHA-1: 1b5f543fc000b39db723d571f08b4c2483bf52ec SHA-256: 16be90e51bf8a50ecc2d3c241e821045215144d937178f85212b83027c63d5f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious infrastructure. This suggests a link farm or SEO poisoning tactic designed to lure users to a malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=ayurveda+books+in+bengali+pdf
    • http://files.equineflow.com/uploads/1/3/2/8/132815385/xifojenuxawizenoduza.pdf
    • http://files.sharqidance.com/uploads/1/3/1/3/131379040/1419246.pdf
    • http://lapeb.geelongrangersfc.org/uploads/1/3/1/4/131407901/nuzataj_venivigunafopi_jekovosug.pdf
    • http://nuwiz.dongguru.com/uploads/1/3/0/7/130775219/bujesexalebader_momigi_sofoviz.pdf
    • http://files.bandedbird.com/uploads/1/3/1/1/131163718/fenovonupepuxud-gejubibonikuk-jazimi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/53799780856.pdf
    • https://cdn.shopify.com/s/files/1/0433/3066/6651/files/telugu_calendar_2020_with_festivals_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/koboka.pdf
    • https://cdn.shopify.com/s/files/1/0430/0491/9971/files/mafunoba.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/tuboludaxubikade.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/62469402439.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2966/files/lewumor.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/rekotubixusidafusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/bebogaxuzinepurorekimonaj.pdf
    • https://cdn.shopify.com/s/files/1/0439/3467/9208/files/top_engg_colleges_in_karnataka.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/26900899084.pdf
    • https://cdn.shopify.com/s/files/1/0430/8048/2967/files/14436001516.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/tupivelokumitasuzebazu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048d2.bin
ad621899529472e6b192ec25242f1369deaf32f22d0f3f78e981ffe47a4c3aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48D2 5564 bytes
font_01_sfnt_off00005be9.bin
99addbc145ceffdde5cdb7c1542f57f804af863ea61c25ab6cac77bc612d5343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE9 9696 bytes

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