Malicious PDF — malware analysis report

Static analysis result for SHA-256 694ad485cee1564d…

MALICIOUS

PDF

51.2 KB Created: 2020-07-31 14:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a715715e71147a03cbc6d770582f3c97 SHA-1: b9384b2478cecdfc7aa53d574031b602b23699c5 SHA-256: 694ad485cee1564db124ff126117800ecaaef8319a5bdf89a39a72f296fd4828
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'rumus baxter anak pdf'. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=rumus+baxter+anak+pdf
    • http://files.paduastore.com/uploads/1/3/0/7/130775013/7282363.pdf
    • http://files.swancreekhempco.com/uploads/1/3/2/7/132740633/525ff48cf6.pdf
    • http://files.a2zcomputerhelp.com/uploads/1/3/1/1/131164479/3642696.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8937/9996/files/67869148774.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/47831741442.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/66065131313.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6551/files/mizudan.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/numesazuwax.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6437/files/tovanefelirigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/39781368183.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/sesewup.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/jepopatefomure.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/bakalisozikuku.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/4160114022.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/kasusamatewilo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/ropovonu.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007574.bin
c92462dfa4e2655716547035d4c4d03e2b9bcb8383cc81b152181c3da82ea539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7574 5156 bytes
font_01_sfnt_off000086d9.bin
7ab64c3be5d6be6129f7b0e471ac7c6869812e1b91aec10e8b213199cd47d786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D9 10228 bytes
font_02_sfnt_off0000a9e8.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E8 16344 bytes

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