Malicious PDF — malware analysis report

Static analysis result for SHA-256 a881a58a9f9cacd5…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 03:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c062c73a674c0bf1a4c1e12c932f5bf SHA-1: 4900b9f979b5378f4c5fad9202a38466f75c1b53 SHA-256: a881a58a9f9cacd5813794be41b851d15dc00eca4b551f16639d3b2cc7f4a090
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a malicious redirector link, suggesting an attempt to lure users to malicious infrastructure. The document body, though heavily corrupted, contains fragments of the URL and text related to SEO link farming, indicating a likely purpose of manipulating search engine results or distributing malicious content through a link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wix?keyword=why+put+rice+in+salt
    • https://static.usrfiles.com/ugd/0dd040_bf5b5eb8c0b84416822612bfff7a716a.pdf
    • https://static.usrfiles.com/ugd/b8c837_341c009ad4dc49fa968a60bcb5cf96e1.pdf
    • https://static.usrfiles.com/ugd/b0cd75_a975674b1ece4bec9a0c0f8ec8bf72b1.pdf
    • https://static.usrfiles.com/ugd/6c98bc_90e06960a423462ca7b2804d27ebf398.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2224/files/belotero_soft.pdf
    • https://cdn.shopify.com/s/files/1/0437/6569/4613/files/4994504909.pdf
    • https://cdn.shopify.com/s/files/1/0432/8908/4068/files/94847757231.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8943/6580/files/87890853592.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/xupepolinibojujovasimofa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/my_house_flo_rida_mp3_download_320kbps.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/17727225541.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9589/files/zajinajubomilimene.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_off00005a5d.bin
65238fc55339673a06d312fbb7ec5d35d663fdffb2018fb20e83a6e4c4eb7a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5D 4908 bytes
font_01_sfnt_off00006b0f.bin
61797a24af6941f2056899e47c29dba2ecbe6e55836d40193a03995154ec13b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 10320 bytes
font_02_sfnt_off00008e56.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E56 4324 bytes

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