Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd30f25ccaedfce1…

MALICIOUS

PDF

42.6 KB Created: 2020-08-04 08:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca91bf8b4241be5b33fb1c1738bc2c10 SHA-1: 889fc9803e5b2f0b92c3d730708b4a1f641f3227 SHA-256: cd30f25ccaedfce18c29c98bcda9d1ec2fe3cdc1977b42a811dc3e5d2b4ef06d
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=ceramidas+iii+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of a large link farm further supports the attack pattern of directing users to external, potentially harmful, resources.

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=ceramidas+iii+pdf
    • http://files.appalachian-auditorium.org/uploads/1/3/1/0/131070051/xuxarep.pdf
    • http://files.shewolfattackteam.com/uploads/1/3/0/8/130815026/fexowo_palixutofe_guwadeguzi.pdf
    • http://files.pershoregifts.co.uk/uploads/1/3/0/7/130738657/5178082.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/rekuwolikazatij.pdf
    • https://cdn.shopify.com/s/files/1/0444/3511/2103/files/cae_gold_exam_maximiser_key.pdf
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/82934008794.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/3749392818.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/27543003014.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/66396375485.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/todomagajesaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7619/files/58424100779.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/36599451710.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/kejuzovurolilememosug.pdf
    • https://cdn.shopify.com/s/files/1/0440/5903/3752/files/selusovagesitugexupig.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/jerawovatakerone.pdf
    • https://cdn.shopify.com/s/files/1/0430/5377/7047/files/kufopaviruxivo.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_off0000691f.bin
4faf76b103d6c361633fbeb57d29c933921cd7c1203aa7b17ee534a1f5690800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691F 5060 bytes
font_01_sfnt_off00007a38.bin
109e58fe7f228f41770c80c32819d3b8f58770050ab90a8c81baa603d54bb510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A38 10484 bytes

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