Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ddd52045864d20…

MALICIOUS

PDF

44.0 KB Created: 2020-08-13 13:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21cb2428c45171df63aabf1f6f58eb84 SHA-1: 1769204530711c6600eabed0311000717f01b33a SHA-256: 23ddd52045864d20dcb25e15c68cabf686676d128a2cb0cc717091dceffcda4e
154 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. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wb?keyword=european%20union%20politics%202016%20pdf', which is also flagged as malicious. This suggests the document's primary purpose is to redirect users to malicious sites through a link farm.

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/wb?keyword=european%20union%20politics%202016%20pdf
    • http://mapezew.iypforum.org/uploads/1/3/1/4/131406947/wumevafote.pdf
    • http://xitebati.totalmotorcare.co.uk/uploads/1/3/2/8/132814930/pojamenorosefe.pdf
    • http://files.donamarafriedman.com/uploads/1/3/1/6/131606360/6886419.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/takavopogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/kesulib.pdf
    • https://cdn.shopify.com/s/files/1/0434/3185/4247/files/6711921344.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/mijovotatafukefananajuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/91574169888.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/17377704573.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/xawukemigazadexefofoji.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/lemimaruso.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/93988522934.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5033/files/business_plan_for_startup_company.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/lawozilawusavuwerekup.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_off00006cd9.bin
d745f7d363f9f39cb838654c78e569d0cf223ee720b6080a242ab423d37c7e68
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD9 5588 bytes
font_01_sfnt_off00007ff1.bin
7d8c37d386fcbef0e13957609b9b68a0f51cc83c9236b5618539d1e2a054ef19
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF1 10228 bytes