Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30913f24d81cd44…

MALICIOUS

PDF

47.2 KB Created: 2020-08-07 04:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2abf8911866b7baaae41b110cdafe7fd SHA-1: 2bae467a978b717220ee3519c6639e89bed0de11 SHA-256: a30913f24d81cd4453759a86feb7ce8e052b3ae78fa6ac4292c0d410d2991587
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The document body, though obfuscated, includes the same keyword as the redirector URL, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking and potentially distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=bodybuilding+exercises+pictures+and+names+pdf
    • http://files.c21discoverycharityevent.com/uploads/1/3/1/3/131381006/linen.pdf
    • http://files.healthafter40.blog/uploads/1/3/2/7/132740193/leburukote_fomugipara_fojogu_mimapizuju.pdf
    • http://files.nhage.org/uploads/1/3/2/6/132683017/7508944.pdf
    • http://files.skmagicpromotion.com/uploads/1/3/1/3/131384340/jagiboxatovovux.pdf
    • http://files.humannaturefoundation.org/uploads/1/3/1/3/131398076/5302311.pdf
    • https://cdn.shopify.com/s/files/1/0436/7033/9737/files/gumetigaropuliled.pdf
    • https://cdn.shopify.com/s/files/1/0430/1363/6259/files/voxifed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54341666742.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/movugeganin.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/xukadubulezotupuvuxomubap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/30043394949.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/pitezifuzipeterebawesimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7347/files/89547405421.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/kuxuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/97368462105.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/74953049730.pdf
    • https://cdn.shopify.com/s/files/1/0429/2286/8892/files/48589614909.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_off0000799d.bin
edf7cdb7bec950997e712d807e551dd52b180d0372af94022aa1841147c3557d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799D 5832 bytes
font_01_sfnt_off00008d73.bin
0483a58529cf2d6e25b0c055e443a1097b45ad2a8897cac65f3be997510eba83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D73 10044 bytes

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