Malicious PDF — malware analysis report

Static analysis result for SHA-256 2296291bc5f67efe…

MALICIOUS

PDF

55.7 KB Created: 2020-08-25 11:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8498e5b8c78ae8e89df973ed55a6db4 SHA-1: 5c71700743d1f10d4ba63bfa7c5465df9229116e SHA-256: 2296291bc5f67efe5fcccb1e13597c2055b3b7fa3c12f4ad3f7dceeef88e7ec7
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains hosting other PDFs. One critical heuristic indicates a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=darkest+dungeon+endless+harvest+guide', which is likely used to obscure the final malicious destination. The document body, though partially corrupted, contains text related to a game guide, suggesting a lure to entice users to click the malicious links. The ML classifier strongly flagged this PDF as malicious.

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=darkest+dungeon+endless+harvest+guide
    • http://files.confessionsofanerd.com/uploads/1/3/1/3/131383657/tiwuva.pdf
    • http://putaxo.dayspring7.com/uploads/1/3/1/4/131453133/kapuwiniwasigad_nasaxanozuwu_betafew.pdf
    • http://files.cchsmo.org/uploads/1/3/0/7/130738917/066151.pdf
    • http://sovem.emateria.com/uploads/1/3/0/7/130776255/5678706.pdf
    • https://cdn.shopify.com/s/files/1/0437/0530/3205/files/korugukiwapipun.pdf
    • https://cdn.shopify.com/s/files/1/0434/1088/2727/files/tibevimofupenike.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/autobiography_of_a_yogi_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5123/files/kogupuvebubalopotexerif.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/bangla_kobita_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/41471609369.pdf
    • https://cdn.shopify.com/s/files/1/0454/2480/3996/files/soul_brothers_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/pavofabuzabezat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2190/1729/files/association_of_former_students_tailgate.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/7678080731.pdf
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/excel_lookup_worksheet_based_on_cell_value.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/css_helvetica_neue.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_off00008eae.bin
6b1163a34d4a67fb2335f6279c352c7bd3fb4d4256f0b0bbc1ba067bdb1b1fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAE 5092 bytes
font_01_sfnt_off00009ffc.bin
b579c4a2f439bbe113e309f486a6ef6ff3237f5e813a15519358c13184cd1e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFC 10420 bytes
font_02_sfnt_off0000c38f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 4324 bytes

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