Malicious PDF — malware analysis report

Static analysis result for SHA-256 2addd2e670fecf80…

MALICIOUS

PDF

55.4 KB Created: 2020-08-21 23:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c2930a96ed85d5e6a70901fa84efc94 SHA-1: 3bddb483ee4e9ece5bb96ad29162e3bc6184d38e SHA-256: 2addd2e670fecf809599cafa6bd758a2815391d03811ec3ce6c1961799633c99
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains text related to job applications and the URL itself includes keywords like 'absage bewerbung praktikum formulieren', suggesting a social engineering lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further indicates malicious intent.

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=absage+bewerbung+praktikum+formulieren
    • http://jurunop.thewinestopper.com/uploads/1/3/0/7/130738950/5525321.pdf
    • http://files.lifesurprisesyou.com/uploads/1/3/2/6/132681931/xegozanozeluzupisol.pdf
    • http://files.psychomadness.com/uploads/1/3/0/9/130969424/64614aac9b.pdf
    • http://kavige.poja-collection-microscopic-anatomy.com/uploads/1/3/1/4/131406149/manimibe.pdf
    • http://kodaw.thefrigginstroke.com/uploads/1/3/2/8/132814930/1199230.pdf
    • https://cdn.shopify.com/s/files/1/0460/5771/7915/files/calendar_template_august_2019.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/shirred_eggs_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tawoxusabevesumaxev.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/ludar.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7174/files/pewakeguwidigufelomawib.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8658/files/83877537656.pdf
    • https://cdn.shopify.com/s/files/1/0462/3305/9479/files/vemiwelevepepukufab.pdf
    • https://cdn.shopify.com/s/files/1/0431/2504/7463/files/26877769842.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/33344362890.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/44713368011.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_off00008229.bin
0c3e7469241191975b064bd2f03eaf9168eaab3a5e948bf44aed6f92ffeaa1f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8229 5504 bytes
font_01_sfnt_off000094e2.bin
41210932cc3bec6ba3c011ec1051d69eca26ad87292fe026226a90ded0ec9914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E2 11192 bytes
font_02_sfnt_off0000b9cf.bin
9fe450f82552266c2fcfc83fa900011047823e529309f2dfa7f3a39f7e432a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 16084 bytes

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