Malicious PDF — malware analysis report

Static analysis result for SHA-256 593fa86bb3d29b26…

MALICIOUS

PDF

45.4 KB Created: 2020-08-09 15:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e8ab36bb276a6e84f520afd9825d3e SHA-1: 24688ecdde792c9b279b17cb2a22bb926598084f SHA-256: 593fa86bb3d29b26517b59073d38c02e9477729a70a8623112956a06aba33542
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'south africa map pdf' resource, aiming to lure users to a potentially harmful site. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=south+africa+map+pdf
    • http://files.tameraboundsforcitycouncil.com/uploads/1/3/0/8/130873951/fusafujovedevoz.pdf
    • http://files.mountainivy.org/uploads/1/3/1/3/131383383/8499704.pdf
    • http://files.helptakeaction.com/uploads/1/3/2/6/132681938/3009213.pdf
    • https://cdn.shopify.com/s/files/1/0437/9282/6517/files/40803476514.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/the_pardoner_s_tale_translated.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3164/files/wivup.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/17615633922.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9653/files/41487502372.pdf
    • https://cdn.shopify.com/s/files/1/0428/7122/6534/files/get_ielts_band_9_academic_writing_task_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6580/files/68791527313.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/gekejutukopakiroz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridojunewosinojep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/4463496241.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/64637128652.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7701/files/mezofogoselamatofemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/79410105420.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_off0000644b.bin
85e4e3f982e4c52882547d52918443bd41f56909316243d5803aaf324a550872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644B 5288 bytes
font_01_sfnt_off00007623.bin
347c6aadb39b4a8c80fe44e84844a1662e4db2c8742ec3060f8bb3feef069d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7623 10284 bytes
font_02_sfnt_off0000999b.bin
e22ca478117900851bb5858ad684dd4f3321a7e50ee5253ce3b428b2ae7ab656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x999B 3896 bytes

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