Malicious PDF — malware analysis report

Static analysis result for SHA-256 789f6594cb87feb8…

MALICIOUS

PDF

49.3 KB Created: 2020-08-21 21:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfadc0910e1d6d505de33f43ff98c925 SHA-1: d29b733faad2d7a00d02938f13efbdd4fed2ce26 SHA-256: 789f6594cb87feb84bd2381613a54ab45b4c8a13734fcddd2534a0ffcca9ce8b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.ru/pify?keyword=drawing+practice+worksheets+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to download further malicious content. The presence of a large number of external PDF links further indicates a link farm or redirection strategy.

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=drawing+practice+worksheets+pdf
    • http://gizinig.goodhealthforgreatlife.com/uploads/1/3/2/6/132695306/8db2a59f81.pdf
    • http://vuzuliloz.sacredcirclecounseling.com/uploads/1/3/0/7/130738902/mesaturoripuwunugak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91428743782.pdf
    • https://cdn.shopify.com/s/files/1/0431/4732/9702/files/ccvc_words.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/hypotension_guidelines_australia.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0972/files/3401167889.pdf
    • https://cdn.shopify.com/s/files/1/0434/1606/0061/files/nuwidojetozikewinopijaxik.pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/chim_chimney_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/8363/6644/files/48834386370.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/16178518487.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/16844145812.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/bin_sachivalay_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faramerujinusopuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulanevu.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_off000074b9.bin
e827a6e839d86e991661328365c397780c1a410ad518443524b2d81c204bcac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B9 5328 bytes
font_01_sfnt_off000086e1.bin
9e14c1b82be83d821fca2b33c0a1567a3857b3926c4654f563459b81e311660f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E1 10192 bytes
font_02_sfnt_off0000a9c7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C7 4324 bytes

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