Malicious PDF — malware analysis report

Static analysis result for SHA-256 a023be6e0bf90a0c…

MALICIOUS

PDF

36.6 KB Created: 2020-08-11 22:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d63fe92741f91fe9ee33a77a1ae60c30 SHA-1: d9020dfc1aa6cad1c153324bda2c3a79c38cb16c SHA-256: a023be6e0bf90a0ca97e4e4ef3814751b626b26bab1e35f0ee3f420eb6461a1e
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 pointing to Shopify domains, but one critical link redirects to a known malicious redirector. The document body, though heavily obfuscated, contains text related to downloading a dictionary and the malicious redirector URL. This suggests a lure to trick users into clicking the malicious link, likely leading to further malware download or a phishing page.

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=cambridge+international+dictionary+of+english+pdf+free+download
    • http://files.feedingtubeawarenessweek.org/uploads/1/3/1/3/131398308/bukagozijajelo.pdf
    • http://files.lifeisthestoriesyoucantell.com/uploads/1/3/1/3/131380008/mubojonelewopi.pdf
    • http://wekoburi.trendsettersdesigns.com/uploads/1/3/1/0/131071157/6595695.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/xexorexarif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32343356061.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/8063493815.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/military_vehicle_inspection_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/wastewater_treatment_plant_journal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/nasugikado.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/66721608139.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/kabaddi_score_sheet_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/sadixewikitijalebe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6599/files/business_mathematics_notes_for_b._com_2nd_year.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_off00004fac.bin
1b1264c10ef34b57cedf71e7a31e13a9118d32b20e16cee70c6f3f5596a0feb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAC 5808 bytes
font_01_sfnt_off0000635c.bin
c9ade2f1e49e62cc384b0bd03eb656e408331778a1e935a71da3821424aab2c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 9868 bytes