Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de83195309618b6…

MALICIOUS

PDF

44.0 KB Created: 2020-07-21 04:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987055867d16486f92c6f0ccaad8636e SHA-1: 200fc30d26f373a648ac12c33b8a9615b4ccd592 SHA-256: 2de83195309618b63c9797f6211229eb7fab0147f621dcbad0dd37c7b9d3b491
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing for a PDF link farm. One of the primary links directs to a known malicious redirector, ttraff.cc, disguised as a search result for 'types of clauses exercises with answers pdf'. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation and the lure text. The presence of a mass of external PDF links, many hosted on Shopify, suggests an attempt to obscure the malicious redirector and potentially engage in SEO poisoning or link farming to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=types%20of%20clauses%20exercises%20with%20answers%20pdf
    • http://files.sebastianwetherbee.com/uploads/1/3/0/7/130740202/8129149.pdf
    • http://files.bildwerkfrauenau.de/uploads/1/3/0/9/130969714/sujetegiw.pdf
    • http://files.ourhousecallvet.net/uploads/1/3/1/8/131857071/semosi-kimixasobal-baxokuw.pdf
    • http://files.psginc-us.com/uploads/1/3/1/3/131380569/fuvimimejiwu-lixifa-xudexuboxe-faxonigigoto.pdf
    • http://files.wjra.net/uploads/1/3/1/0/131070527/vogadutiwovazin-guxoxuse-tegivoxafarat-xomuxaki.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/tagajofiritoto.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/66490107289.pdf
    • https://cdn.shopify.com/s/files/1/0431/0584/5397/files/48377487562.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/81487828567.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42778981568.pdf
    • https://ruziridolisa.files.wordpress.com/2020/07/wademadonoboj.pdf
    • https://kajulak.files.wordpress.com/2020/06/8570268519.pdf
    • https://miwubane.files.wordpress.com/2020/07/9743115870.pdf
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/sinukogiv.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/domaxob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/20382858029.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/61898784453.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/41826707368.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/51845425006.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bojakotipizijogi.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_off00006da7.bin
1f60f6edc9aeb2023d1579489ae1acff309ce28d1eff7b366f93af047c85ccb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA7 5336 bytes
font_01_sfnt_off00007fe5.bin
d232332c990579bb44fa107971855c0e072b6ec2c3d00cd0579ec79475014813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE5 10116 bytes

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