Malicious PDF — malware analysis report

Static analysis result for SHA-256 d597f1c20d002e23…

MALICIOUS

PDF

41.9 KB Created: 2020-09-04 22:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4cf526fe874f9cc0c74f9fa0aa48953 SHA-1: 802cd611bb655121df0c0c73fb6af0144760bced SHA-256: d597f1c20d002e230c0a5d4b205d124e2055e1c16a43951dd83c5d45db7dfc6d
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/pify?keyword=lagu+aku+mundur+alon+alon+ipank', which is also listed as a malicious redirector. Additionally, the PDF contains a mass external link farm, with many links pointing to static.usrfiles.com, suggesting an attempt to obscure the final destination or distribute content widely. No scripts were extracted from this sample.

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.club/pify?keyword=lagu+aku+mundur+alon+alon+ipank
    • https://static.usrfiles.com/ugd/affaa6_1409352cfb27467a9c7cb2d003e8a829.pdf
    • https://static.usrfiles.com/ugd/3dd68e_47774bfb8e674ed79d1bbc9ad1c8a5d1.pdf
    • https://static.usrfiles.com/ugd/c57cae_4db751c97e3b4365b09eb5061598e55f.pdf
    • https://static.usrfiles.com/ugd/2994dd_6cdf351d1db845dd93c6865fe9b100ff.pdf
    • https://static.usrfiles.com/ugd/409ca8_6142e65860e345999892ff1bcbe6dd67.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/30453865056.pdf
    • https://cdn.shopify.com/s/files/1/0438/6412/9696/files/24804195736.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/boveberomunarukikojobuba.pdf
    • https://cdn.shopify.com/s/files/1/0438/0285/3538/files/introduction_to_automotive_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0465/3193/6414/files/guidelines_for_procurement_of_consultancy_services.pdf
    • https://static.usrfiles.com/ugd/345929_016e9723ded843ed97457b3870d23e2a.pdf
    • https://static.usrfiles.com/ugd/dd4472_272560bf40e4441ab39e154f5e92c32a.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7160/files/samibejagurokiremu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/renesiwudakineguboxi.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_off0000518d.bin
3c117bdb518fc2b733b9b1fc838f261855183a7b2986654071d9cb85718794b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x518D 5108 bytes
font_01_sfnt_off000062db.bin
a0ba33cc81ed79cbb8ed948216779b1f115837bf4a905c14ec3155e05e7c97df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DB 9988 bytes
font_02_sfnt_off0000856f.bin
a109d5cc1a8599929bd7702a943337bd153faf2776ff4e30ac39a15e38c17cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856F 16204 bytes

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