Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53fc9bf22086d33…

MALICIOUS

PDF

59.7 KB Created: 2020-08-12 13:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1dfb52fa01e807b64971f764f3219b1 SHA-1: 23b0628c4fa43951eb56224115c68517f4089c4b SHA-256: c53fc9bf22086d333823303e42dd3844d04f5ad7fdaea8315a82010404d7c74e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, many of which point to external PDF files. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=malayalam+kavitha+aswamedham+lyrics+pdf'. The document body contains garbled text but includes this URL, suggesting a lure or redirection mechanism. The presence of numerous links to external PDFs, including potentially malicious ones, indicates an attempt to either distribute malware or engage in SEO manipulation for malicious purposes.

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.ru/pify?keyword=malayalam+kavitha+aswamedham+lyrics+pdf
    • http://files.sbcdallas.com/uploads/1/3/1/3/131398428/2e0431c00e7.pdf
    • http://files.lavishsalonharrisburg.com/uploads/1/3/2/8/132814990/pojanokuja.pdf
    • http://files.mitafrica.com/uploads/1/3/1/4/131483217/ledusar.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1597/files/millennium_development_goals_ghana.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/running_a_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5804/files/problem_statement_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0681/files/runa_vimochana_angaraka_stotram_in_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7339/5101/files/upsc_optional_subject_sociology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/jisasibavun.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/namibapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/demonenovevuxonusama.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/bisitovutimudugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8316/2019/files/field_guide_to_american_houses.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
stream_004_off00008cad.bin
12515b806c9d8a8492565f6f4387b56db0c70e51c2ee2a6b14c9bb3b1f6ce38a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8CAD 15352 bytes
font_00_sfnt_off0000794b.bin
e1368fcc244a579180814f743ca036fde4761bf914337917f6889cb702fa4a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794B 5720 bytes
font_02_sfnt_off0000bd5f.bin
b5df0895b75bf54836bed39057fc061b88789def2f6b98b023d85fad55b599d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5F 10928 bytes

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