Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d1c54b8b81d78c…

MALICIOUS

PDF

87.4 KB Created: 2020-08-03 19:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ca8ab7cbcb8be147586f61b516b8e9 SHA-1: a649c1494bfb95dd8660014e0704ea18ffadb42e SHA-256: b5d1c54b8b81d78cd557f4d05d8e9802ae011c6904b522515543996b1b9fb10f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the text 'Literature review on annona muricata pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=literature+review+on+annona+muricata+pdf
    • http://files.brrclub.com/uploads/1/3/2/8/132815343/9924451.pdf
    • http://files.kathrynkohorst.com/uploads/1/3/1/6/131606343/fisuxovelotiki_gugulozafari_zijagi.pdf
    • http://files.dlaf.org/uploads/1/3/0/7/130738894/bakefenonef-gexofuv-sipubedin-vesowiv.pdf
    • http://files.indypolevaultjumpscamps.com/uploads/1/3/2/6/132683334/supuduxezok.pdf
    • http://files.nadeemkhan.net/uploads/1/3/2/6/132695714/nazurira.pdf
    • https://cdn.shopify.com/s/files/1/0435/4224/9631/files/54024144724.pdf
    • https://cdn.shopify.com/s/files/1/0435/5699/5233/files/substitution_property_of_equality.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/46854347195.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/73920807720.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/75847198374.pdf
    • https://cdn.shopify.com/s/files/1/0436/0355/8564/files/sarotej.pdf
    • https://cdn.shopify.com/s/files/1/0434/1307/8168/files/wetugigu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87743453122.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/lojutomufufupudesobif.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9575/files/feloposezegetomeliwudeg.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_off0000f926.bin
c2e5abfb70a821fd7d7f121d406c1b26679349aa25c8c5f367d68a08d9ab83d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 5184 bytes
font_01_sfnt_off00010ad2.bin
35f09c6098b01b677cfa21d039b6d15de49f6cbef06508671dd4c641935ee488
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 15416 bytes
font_02_sfnt_off00013b16.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 16060 bytes