Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e97dd007404426…

MALICIOUS

PDF

46.6 KB Created: 2020-08-29 03:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76dc5e4b2d6d102da8a306ce4c96a1c SHA-1: 9d7414327abd0419dc2337100f291f3663e88cc2 SHA-256: b4e97dd0074044263cc655623fa690f753259b490b9e63080d8466f46a964304
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=quartier+des+amidonniers+toulouse'. Additionally, it exhibits a PDF link farm behavior, with numerous links to Shopify-hosted PDFs, one of which is 'https://cdn.shopify.com/s/files/1/0431/9074/7295/files/gejejiwiwaromuwogomajaxof.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting an attempt to direct users to malicious infrastructure.

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/wix?keyword=quartier+des+amidonniers+toulouse
    • https://cdn.shopify.com/s/files/1/0431/9074/7295/files/gejejiwiwaromuwogomajaxof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/buzzwords_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/10960716704.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6808/files/22538909630.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/zeginudewan.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/73512467569.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/actuadores_electricos.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/paper_towel_absorbency_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/medical_definition_of_death.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesuwalaloluxafim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7122/files/23496518011.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/gapinemalomojexezikapuneb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b18c0ffc66744c3c871f2457452c1d9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_748595b44b634482ad4210d496bfe28b.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
font_00_sfnt_off000067d5.bin
4a52e489d9db5468f3a2f9e96029695fa6fe401c021bbb0709a0b2358da4b515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 4912 bytes
font_01_sfnt_off00007866.bin
989a68732c237380a821be4b5899ad7db9267e4a26cab4dcb635709f8a84165e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7866 11780 bytes
font_02_sfnt_off00009d93.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D93 4324 bytes

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