Malicious PDF — malware analysis report

Static analysis result for SHA-256 50120910f4fdd447…

MALICIOUS

PDF

68.3 KB Created: 2020-08-23 10:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6600dedcd597c3bcb5f750e140ddacb SHA-1: 46501ee360ec804c44f200c5fa7bfb64c20e87f2 SHA-256: 50120910f4fdd447242901f370cbb3674bc33cf42867fe9a6411ab63e62bd4cd
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=malayalam+movies.+com+2018'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be malformed or obfuscated, but the presence of the malicious URL is the primary indicator of compromise.

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=malayalam+movies.+com+2018
    • http://files.idahoflyer.us/uploads/1/3/1/6/131636930/842ab7a2c1.pdf
    • http://files.kairospartners.io/uploads/1/3/0/7/130739120/tizagir.pdf
    • http://kinodi.windandrhythm.com/uploads/1/3/0/7/130775045/d595209ff.pdf
    • http://files.denisegrobbelaar.com/uploads/1/3/0/7/130775588/fowujakusibafa.pdf
    • http://files.shenandoahpermaculture.com/uploads/1/3/1/4/131453031/b5c0ef2b07941.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0376/files/tajakimuxufupunun.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/80122184175.pdf
    • https://cdn.shopify.com/s/files/1/0440/0542/5310/files/zezufixujazugap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/xedoroxogewob.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/5e_lightly_obscured.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/best_business_ideas_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/birezavolizatubamegolokig.pdf
    • https://cdn.shopify.com/s/files/1/0441/0467/9576/files/time_lapse_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5876/files/14016710016.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b4ac.bin
251e4ee5e8f26f308d26cce81af01501680d69009238f542bc46491c47b1e9dc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB4AC 8020 bytes
font_00_sfnt_off0000a30a.bin
50c44c1c5763a9d9f63cc91c4b80f9f20eba50aa156343eef793b436ce315713		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA30A 5172 bytes
font_02_sfnt_off0000d0d0.bin
f5cd4d773c86904fb3439d8ade60ff9402d669c77ad3f489400ca5ce17fa0644		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 10620 bytes
font_03_sfnt_off0000f542.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 4324 bytes

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