Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a335b66c459e98…

MALICIOUS

PDF

55.7 KB Created: 2020-07-31 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5acfffe268ae147b7b0326de1574532 SHA-1: b4579df49a15f49a099fc9d7c8183e396777124c SHA-256: 37a335b66c459e98584f20c81a73f88708c7973176ac07f8af11dd1faae3dd0f
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identified a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of its specific intent beyond link distribution.

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=apc+smart+ups+1500+rack+mount+pdf
    • http://files.guerrillazoo.com/uploads/1/3/1/0/131071043/dikatuje.pdf
    • http://files.learnfrombarrymaterials.com/uploads/1/3/0/9/130969306/64767183d3cc.pdf
    • http://files.hi-sol.com/uploads/1/3/2/8/132815752/485db62d3.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/14498981317.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/wojivuviter.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/pogapokigabisivunejaxol.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/35581821852.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/pizatujojopeligu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/doporonadulikida.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4577/files/vekuvutimadijozalazi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zurutadodusabexefiba.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/daroguzepotazinisemupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/81555899780.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/gugijogenogupafiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/27502652862.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/69155784320.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000086b1.bin
4e8d22f5ad554c9d746a045d7bb01cbc7b619379ca5ead5167430454d44493c9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x86B1 13536 bytes
font_00_sfnt_off000074a6.bin
5803ce91d621b9113d1ba1278e48b4d276ad235051a45975e245404ca613e920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A6 5356 bytes
font_02_sfnt_off0000ad39.bin
a231166adab8d9618bc097260a5753ace2dd81cc73d811cda4738685c7c6940c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD39 10604 bytes

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