Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3873a9ebe00dba…

MALICIOUS

PDF

38.3 KB Created: 2020-08-03 12:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6857aa362498c7ab014dd15d8372e1f1 SHA-1: 380c2cb684e05e60f40df1eae5c1caffe418bf9d SHA-256: cb3873a9ebe00dba13ccdb980c14a68a1a64b7297bddff39a1fc910015cd59b4
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes text related to a 'Rotex pneumatic cylinder catalogue pdf' and mentions the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The heuristic firings confirm the presence of a malicious redirector link and a large PDF link farm, indicating a probable attempt to distribute malicious content or phish users.

Heuristics 3

  • 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.
  • 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=rotex+pneumatic+cylinder+catalogue+pdf
    • http://files.vigocountycrimevictimassistance.com/uploads/1/3/2/7/132740399/norupusobijemamezav.pdf
    • http://files.vivocollegemusic.com/uploads/1/3/1/1/131164052/7408558.pdf
    • http://files.littlestarsfamilychildcare.com/uploads/1/3/1/4/131406149/padepeline_vebofujujero.pdf
    • http://files.poiseandco.com/uploads/1/3/0/7/130739198/mudegem_xoxumosazegez_zutalis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8524/files/korekam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/xuwalotilidetez.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9175/files/sefegotibarazor.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/wegekoxemigufuxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4119/2101/files/misizurewatusoritipazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/23134389958.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/60883757972.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/45525808962.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/48740453992.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/18894237451.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/tibujur.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_off00005705.bin
5122067552534ff1ebfbd0090adbf239fa9c7771da555046d1df9f91a92f6211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5705 5472 bytes
font_01_sfnt_off000069a2.bin
aa00a6b22cd965723424cc7c6408e54d7e6298edbb39062785ca668808bc9e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A2 10172 bytes

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