Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab334d1a2db66e9…

MALICIOUS

PDF

41.4 KB Created: 2020-08-23 22:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5696174ff4402b85809ad9cd4e12a15 SHA-1: 6019698d8ddbb53553272004c67c35f279b1875a SHA-256: 8ab334d1a2db66e9888f97786027b7bd9488f6e48b461536356ee6fd8ad5791b
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm, suggesting an SEO poisoning or phishing attempt. The ML classifier also strongly indicated maliciousness. The embedded links, particularly to 'ttraff.cc', are highly suspicious and likely lead to malicious content. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

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=circleci+2.+0+android+emulator
    • http://jekepijex.world-magician.com/uploads/1/3/1/3/131379732/gebepirinomo-tidaputut-neped.pdf
    • http://files.grandvalleyfibre.ca/uploads/1/3/1/4/131453636/ed4b7377bbe9.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kusamusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/wukiraxetevereponure.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/35638714165.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/62101075976.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/17673888067.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3330/files/saxikire.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4415/files/41381711999.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/turoruwetoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1571/files/66298481065.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/zarinesaja.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_off00005d01.bin
9a22e771401cfcf64747e8bf128e23da1bb763e5ea59d1aa09f3c155fc7e7e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D01 5120 bytes
font_01_sfnt_off00006e42.bin
cd1f5d8e833e2f83afee18e3a9cbb7150883931f8bf3e8fa0f744c2eec0597e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 13472 bytes

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