Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c071af7fd1490c0…

MALICIOUS

PDF

57.7 KB Created: 2020-08-04 23:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bfa8c4b5174afb40ef3097f159c31cd SHA-1: 53747ba40b914b10600392b4a1c5df272694df90 SHA-256: 3c071af7fd1490c0c9bf9e8bd2582dc61a9cde06d770e06db2c2aa6cfb1c16b4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=patofisiologi+neoplasma+pdf'. This URL is designed to redirect users to potentially harmful content. The document also contains a large number of external PDF links, characteristic of a link farm, further indicating malicious intent. The ML classifier strongly supports the malicious verdict.

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=patofisiologi+neoplasma+pdf
    • http://files.meesespieces.com/uploads/1/3/1/3/131382531/c0c433c279794.pdf
    • http://files.gonewiththewindgoats.com/uploads/1/3/1/4/131453989/vezavuxutopano-xesufakiti.pdf
    • http://zinesabun.allthingsartstudio.com/uploads/1/3/0/9/130969551/f46e634c7eb1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0431/7062/7735/files/20200760576.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/44972943284.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/passport_renewal_application_form_australia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3845/files/maytag_quiet_series_300_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/ts_file_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7590/3383/files/sifexokuwurovobefide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1595/4847/files/luziku.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/2368265420.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/jozojibos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/14034041438.pdf
    • https://cdn.shopify.com/s/files/1/0434/0390/3127/files/37242888892.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_off00009528.bin
c37faf5ef7c4e20382ce3389f1c84bc42e4fcab743466ab7b15f3faa6fdb2197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9528 5056 bytes
font_01_sfnt_off0000a643.bin
2f4de2d2568aa6154689403ea4cfd3e40b330f7d8aabdc513b0d4db282bf0725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA643 11356 bytes
font_02_sfnt_off0000cb86.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 4324 bytes

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