Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcd55b857163b2b…

MALICIOUS

PDF

50.6 KB Created: 2020-08-12 16:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e246f96af3fa2559e4c83bfc5f948bc9 SHA-1: 57ea899ee0a374b9d2f6b1216c8e0f4c92942867 SHA-256: ffcd55b857163b2be7fa254a84963230b001df8246a0a3916be8db470b3e311a
154 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for containing a malicious redirector link. The embedded URL, https://ttraff.ru/pify?keyword=ramadan+calendar+2020+lahore+pdf+download, is a known malicious redirector. Additionally, the document contains a large number of external PDF links, many pointing to benign Shopify domains, but some to unknown domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=ramadan+calendar+2020+lahore+pdf+download
    • http://files.hello-baby-toys.com/uploads/1/3/1/4/131453807/4352687.pdf
    • http://files.spsyc.online/uploads/1/3/1/8/131856545/08e34.pdf
    • http://files.littleegyptlyceum.com/uploads/1/3/1/4/131437924/fesipemumeda.pdf
    • http://files.todos-juntos.net/uploads/1/3/0/7/130739758/rekiledegowis-gubamomabu-boziwazok.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/allen_bradley_powerflex_525_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8724/files/28317452403.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/45770195023.pdf
    • https://cdn.shopify.com/s/files/1/0432/2145/0914/files/geragebitatusisugoguze.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/36595349850.pdf
    • https://cdn.shopify.com/s/files/1/0436/1096/4131/files/37591955662.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/fejasusit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/bowling_alone_putnam.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/gesewukip.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/tipitupiwo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e5e.bin
83524a06faad28e2c02473c51187ca56e625deddc092d45b5894345364d93ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5E 5252 bytes
font_01_sfnt_off0000700f.bin
03ddf90fd6b4b7e4f854928047a3f335d45685064428a9ebfdcdb8e64a4a596d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700F 11084 bytes
font_02_sfnt_off00009496.bin
ec18d018af276069dd8a0c8f82e333663a3c7705d2614a336eadeb591bcacf69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9496 17692 bytes
font_03_sfnt_off0000aeb6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB6 4324 bytes

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