Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb371b8186c94e37…

MALICIOUS

PDF

37.9 KB Created: 2020-08-04 17:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ffdde6cce6fc48320c9ee7d9e3c37e8 SHA-1: 3ed0d4d7ba8a9e6dab92fb89fcf725883496c25a SHA-256: bb371b8186c94e3726b78bb41ca2737664b4f07195a97e762e6b0206584a372b
152 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 a link farm hosted on cdn.shopify.com. The primary malicious URL, https://ttraff.ru/pify?keyword=binary+subtraction+using+1+s+and+2+s+complement+pdf, is identified as a known malicious redirector. This suggests the document is designed to lure users into clicking these links, leading them to malicious content.

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=binary+subtraction+using+1+s+and+2+s+complement+pdf
    • http://files.mcloughlansupplies.com/uploads/1/3/1/6/131606140/zepawonofatig-liveleraw-bugezitimijiz-minemakitoxuvub.pdf
    • http://files.joylesscreatures.com/uploads/1/3/1/4/131438539/59a9d260dc4b0.pdf
    • http://files.mayrosehurst.org/uploads/1/3/1/4/131438188/de69fd610.pdf
    • https://cdn.shopify.com/s/files/1/0435/1364/3167/files/96172680213.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/memibumemogurab.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/83367014795.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/kabat.pdf
    • https://cdn.shopify.com/s/files/1/0429/9223/8745/files/skull_trooper_purple.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/zokakibutogexag.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7519/files/55367968203.pdf
    • https://cdn.shopify.com/s/files/1/0440/6909/3541/files/painting_with_light_john_alton.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/9407523573.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/nowodopuzurasemape.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/powajanabuguwafemonomup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.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_off00005461.bin
66e46dc98c60dbe3b7e6dacedf40908a02442d7df5596d7f62f150bab9e00845
pdf-font-stream PDF embedded font (sfnt) at offset 0x5461 5952 bytes
font_01_sfnt_off0000689b.bin
9dbb8e8f1c2332b5591b403a799c28ee25e22cb300893565a50fc74f139fcdc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x689B 9812 bytes