Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac3ecb1c6ffe307…

MALICIOUS

PDF

44.7 KB Created: 2020-08-10 23:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efc03c035b775654063a572c4de6af0d SHA-1: 32743c8499cc215457f2702efa0920603f361ba9 SHA-256: cac3ecb1c6ffe3070a1ca9f702a3bb91d0fafc5902c0163280e260ca9187ee1b
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that points to a redirector service. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or malware delivery. The presence of numerous external PDF links further supports this, indicating 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.ru/pify?keyword=fearfully+and+wonderfully+made+book+pdf
    • http://files.ravenaterra.com/uploads/1/3/1/3/131380005/da0e404c2e2bb0a.pdf
    • http://lupalinot.lickingvalleypac.org/uploads/1/3/0/8/130814328/2982696.pdf
    • http://files.queenbridal.com/uploads/1/3/1/4/131437513/vikiwu-sujeruzamusevog-riwusokufutar.pdf
    • http://files.edygies.com/uploads/1/3/2/6/132680855/sodetoruvukafado.pdf
    • http://sesil.abbotsfordanimalhospital.com/uploads/1/3/1/6/131606289/tibufezakixavej.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/nuvodijedimivivet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/1910414941.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/flight_ticket_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/22873263327.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/6059508105.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/91284044914.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8262/files/271496496.pdf
    • https://cdn.shopify.com/s/files/1/0436/2174/4803/files/molagiwokozopikelola.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/41959374197.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/bangla_book_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/60421074694.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/wuwefaneki.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000706c.bin
9242fbd1d30af29106742e568fee6ec8df28468edd3a413fbd5eff5221f2c537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706C 5360 bytes
font_01_sfnt_off000082ae.bin
cfec27c70e7f6901100ad944aad265768a1c68ce1f3af2ee717eb73a255debc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82AE 10288 bytes

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