Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f82002c9fd86da6…

MALICIOUS

PDF

52.2 KB Created: 2020-08-08 14:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25e4705fceb260cd069d9786431bf76b SHA-1: 3aa8cef548b6ec3b28a9ac287240eca22b092440 SHA-256: 5f82002c9fd86da6ffdadb37b8f691da096201177dbb1332bd01a6179b98d20c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to PDF downloads and the malicious URL. The presence of embedded links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=adda+247+data+interpretation+book+pdf+download
    • http://files.shreyanshjain.net/uploads/1/3/1/4/131437680/222513.pdf
    • http://files.brookeahnaeportfolio.com/uploads/1/3/1/4/131407144/wojepegabupaguvik.pdf
    • http://files.ttownacres.com/uploads/1/3/0/7/130776611/gunukirut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/wezemadedunobus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/analytical_reasoning_questions_and_answers_for_nts.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/wezejaxegufepu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/vejil.pdf
    • https://cdn.shopify.com/s/files/1/0446/1517/2259/files/dna_replication_molecular_biology.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/lebeninaraje.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/pizoloxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/filararerovexenujavilalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/kodiketafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/56898266339.pdf
    • https://cdn.shopify.com/s/files/1/0435/4870/4920/files/godufatigakoxakipad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2509/files/27911636819.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fa2.bin
1be0fc69d9d12930f73c115e79cd6ee0c20ee0a175beecd3611795cf616217fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA2 5232 bytes
font_01_sfnt_off00007189.bin
94102c6a01a7ac7d5affc43e5656e0bb7ea092bb122ac6ca9cff539ade4f158d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7189 2024 bytes
font_02_sfnt_off00007b20.bin
185be09556cd0a7c505053baef3ee8be40dcb8e1c951573c032100fdbc35884d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B20 9968 bytes
font_03_sfnt_off00009d3f.bin
970d398b79cc823ba1d70f8f5d377eba6df407104e804fdad1d159eacff224f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3F 16752 bytes
font_04_sfnt_off0000b449.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 4324 bytes

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