Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72568ac97cff7c5…

MALICIOUS

PDF

47.2 KB Created: 2020-08-03 05:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8f6fbce564a32de63bc389fbab9def5 SHA-1: c9fabc6e159aecef717c7cb774f8779ef714bd76 SHA-256: f72568ac97cff7c57115f221ea6795fc640b7fa899b7de44c8723ce08f8561dc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.cc/pify?keyword=ehome+infrared+transceiver, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains embedded URLs, suggesting a lure to external malicious content.

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=ehome+infrared+transceiver
    • http://files.simleysoccer.com/uploads/1/3/1/4/131452942/puvamitem-zirazite-kozegan-gamezam.pdf
    • http://files.samanthacotterill.com/uploads/1/3/1/8/131871621/5192610.pdf
    • http://files.primepremise.com/uploads/1/3/1/0/131071114/a9ffbdddd57de.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/rafuwofiwuwisifof.pdf
    • https://cdn.shopify.com/s/files/1/0428/8187/6131/files/xumenavux.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/nosiloripelusugak.pdf
    • https://cdn.shopify.com/s/files/1/0432/9675/1774/files/89904981860.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/javascript_array_methods.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8847/files/58205690354.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/kesojuxilewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibuzos.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/fowejekadisurawowozun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/rukelagugoso.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5841/files/witadogopifojafitusez.pdf
    • https://cdn.shopify.com/s/files/1/0434/2965/8790/files/39240673421.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_off000075b4.bin
5f703f0c3e93ae7836e8f9e341b376e6b7af7503e72620271ea3cd37d6719b35
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 5244 bytes
font_01_sfnt_off0000876b.bin
17dd720a6c4e659e165757c2628e880bc677cf07f45168de1baef49cc0e69876
pdf-font-stream PDF embedded font (sfnt) at offset 0x876B 12524 bytes