Malicious PDF — malware analysis report

Static analysis result for SHA-256 47db40ff88a402d3…

MALICIOUS

PDF

82.6 KB Created: 2020-09-18 01:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b88ff80e72e40ca457907ddc66e547d SHA-1: 7e5d3179b21d536381510abccbab3241b863862c SHA-256: 47db40ff88a402d3dacbb0fc92d816e6db2d4ba20464c3a64e777ce2225e1def
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.club/wix?keyword=finding+percent+by+mass+worksheet+answers', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'finding percent by mass worksheet answers', suggesting a lure to trick users into clicking the malicious link. The presence of multiple external PDF links also indicates a link farm 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.club/wix?keyword=finding+percent+by+mass+worksheet+answers
    • http://files.peltonfellbowls.com/uploads/1/3/2/7/132740685/8718554.pdf
    • http://files.selfhn.org/uploads/1/3/1/4/131438324/jajerekisin.pdf
    • http://tikabomo.claybypat.com/uploads/1/3/1/4/131453540/fff60485.pdf
    • https://bcbba245-c809-4ae2-94b1-869dda95ad93.filesusr.com/ugd/003b86_30ff962999d643ad823f856114c2854a.pdf?index=true
    • https://e3682938-c9fa-48db-95ed-a8e835a33605.filesusr.com/ugd/0d018b_fbe38ed326204f7189520173b6c5e29e.pdf?index=true
    • https://82a1ed7e-c05e-4835-968f-a27561af2096.filesusr.com/ugd/3ddeef_2e259ae0b6e24953a7890e44ab204fcb.pdf?index=true
    • https://03bad93b-4122-458e-abde-fdcbc8264480.filesusr.com/ugd/e4ff69_9f5a3bc4d63a4e6c9989d1accad7c9ce.pdf?index=true
    • https://8f0e0c8c-edf7-4c18-8cc0-48fed1aa7bf7.filesusr.com/ugd/717a42_5aa62cfa9b724cf68289e44e8da23ccd.pdf?index=true
    • https://77803d78-eedc-4843-be1a-6d0a37f78f98.filesusr.com/ugd/23a6c3_6c84b46d42a6440a8c87adcefd1bd63e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/log_antilog_amplifier.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/27027718164.pdf
    • https://cdn.shopify.com/s/files/1/0464/5175/3128/files/buy_bedsheet_singapore.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/15357527457.pdf
    • https://cdn.shopify.com/s/files/1/0457/9783/4918/files/life_after_death_book_in_telugu.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_off0000f71c.bin
3a4f0f8457da5407f96f4b4ac2e98353a72574671a4b019e1684d9984c0762a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 5596 bytes
font_01_sfnt_off000109ff.bin
de71d2383a64aeebebd845c1bee9f1ed01fc004c1bc80d051230ef4d5bec8b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 10896 bytes
font_02_sfnt_off00012ef9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 4324 bytes

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