Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc5f10b5fe08564…

MALICIOUS

PDF

58.0 KB Created: 2020-08-08 01:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c631d214caeef4ad93146a1edf6ac45 SHA-1: 3478f3a7e79c2eb1e78f88814b109d93902fe8a3 SHA-256: 0bc5f10b5fe085645faf6fffb2cfa0bf20555209f4abbf7c5e8b86871ea2cb47
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links redirects through a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious redirector URL.

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=ordinal+scale+of+measurement+pdf
    • http://files.allcharacterswanted.com/uploads/1/3/1/4/131407469/pezituledinaf.pdf
    • http://files.chargerstage.com/uploads/1/3/1/8/131872055/sitoj.pdf
    • http://files.praisetabhawaii.com/uploads/1/3/2/7/132712011/sugeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5771/7143/files/61004464382.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/pakinejazikizamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/wodojubavudexo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/45607786995.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/www._act._org_compass_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/77892107898.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/tujapadifavuwofaturiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/6351/7092/files/13893904468.pdf
    • https://cdn.shopify.com/s/files/1/0449/9750/9278/files/atharvashirsha_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/628039883.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jibivugutujul.pdf
    • https://cdn.shopify.com/s/files/1/0440/2996/8534/files/49262793943.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a535.bin
7ac4b8db31ec9647de5d359cf0a4c7465fadfd9c1ddfff1afd292f10c46d22f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xA535 5328 bytes
font_01_sfnt_off0000b737.bin
6b78ef53cad3aa7f241d2ed5dceccd9d408ec765afdc6e624c57521832a5cfaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB737 10424 bytes