Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a697a4e62748b93…

MALICIOUS

PDF

40.6 KB Created: 2020-08-15 08:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72875a233e9469e10b99faac9145a44 SHA-1: 1890e7ae695147c1779c5c47fecbec0a583e1542 SHA-256: 1a697a4e62748b931ce4ba3bfe736c0a435610c859ee9bc3c2394f3d77cd3c84
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple Shopify-hosted PDFs, which in turn redirect to a malicious domain (ttraff.ru). This technique is used to obscure the final malicious destination and evade detection. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains numerous external links, consistent with a link farm attack pattern.

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=asiana+a330+business+class+trip+report
    • http://files.pnagkc.org/uploads/1/3/0/8/130874566/pemulewebikijab.pdf
    • https://cdn.shopify.com/s/files/1/0440/7004/3813/files/fawesusifelan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/xuwivigibipowebep.pdf
    • https://cdn.shopify.com/s/files/1/0440/2210/4222/files/70671256929.pdf
    • https://cdn.shopify.com/s/files/1/0431/0050/4217/files/rojoxaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/dallas_cowboys_cheerleaders_best_performance.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/adverbs_before_adjectives_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/old_spice_whistle_ring_tone.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/1583161405.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/66708022250.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_off0000615e.bin
d27c6ff53a0cc83d9ef71cd7df6a016f6f1b2ca065e1718371d3ee6f0f29f7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 5360 bytes
font_01_sfnt_off0000738b.bin
2bcda3208ff70a49082e73cf3a5c122a7e52ae2f3c2ca58c2a4ddd52a8d4c9b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738B 10060 bytes

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