Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b182096d47e514…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 05:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 240a48cab974caa529a4571b9c7054a7 SHA-1: a1544b02d13926f37d753341c85d9bef477b5d15 SHA-256: a8b182096d47e5148744903cb86cbd1776a2fd08f97ff99082454c10693680cc
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a redirector service (ttraff.ru) disguised as a feasibility report. The ML classifier strongly indicates maliciousness. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning.

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/wix?keyword=feasibility+report+of+a+road+project
    • https://cdn.shopify.com/s/files/1/0463/1396/3677/files/apple_ipod_usb_driver.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/facebook_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3198/5309/files/who_makes_the_best_mattress.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/49773099063.pdf
    • https://static.usrfiles.com/ugd/e3ff21_8afac34ad8874e69bbeff2b327a71ac0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6919ffb555e6458f9eca6a2dadef92d9.pdf
    • https://static.usrfiles.com/ugd/2b25b5_734f2df35e8346f7af3ac65be2790ab2.pdf
    • https://static.usrfiles.com/ugd/87d215_dc48038f874845f3b19efaf695ffdcb6.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/bakipotekamagoraveke.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/rujadutido.pdf
    • https://static.usrfiles.com/ugd/b8c837_9690b3e34f7743159963d5027f40e0e5.pdf
    • https://static.usrfiles.com/ugd/432b07_a001536822e345fc9740e1fe06f7e751.pdf
    • https://static.usrfiles.com/ugd/b8c837_960112edbdbf4e43a1dc4431a4aea00f.pdf
    • https://static.usrfiles.com/ugd/0c268c_85f79178b1c74efe91500cf5acb06a09.pdf
    • https://static.usrfiles.com/ugd/565485_17a52adb9fd94428850799e07ab6b333.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_off00006952.bin
383c0f9401974b34c5fd814950611b486cca4a1ce9916fd86b53d65133042805
pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 5420 bytes
font_01_sfnt_off00007bcf.bin
8d4e5aa9b7d60ca164ce4178ac81d5ad45074ad87ffb8158448642a1eea7f7b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCF 10344 bytes