Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6689de01665f3c…

MALICIOUS

PDF

66.4 KB Created: 2020-07-27 10:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e162a5e9c7764b67f4ac8f11bd08b1ab SHA-1: 58d4ca59e4aa37453099fcf81270958855ea3564 SHA-256: 0d6689de01665f3cc18e243fda9daa4266e0497b688649e4563f0ff23a1c667f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or leading users to phishing sites. The heuristic 'PDF_SEO_LINK_FARM' indicates the PDF contains numerous links, suggesting an attempt to manipulate search engine results or distribute a large number of malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=tnpsc+app+exam+answer+key
    • http://files.mrschaeffer.com/uploads/1/3/1/3/131380627/458878.pdf
    • http://files.awesomeosity.com/uploads/1/3/1/1/131164386/7948468.pdf
    • http://files.trainingwithfausto.com/uploads/1/3/1/3/131398143/lofesopilekeligun.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4058/7423/files/9440477945.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/kusezoxud.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/24975980505.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8703/files/puvowoxuwukajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/90740845748.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/mifan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/xulekijetuteroxuzixe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/26750360223.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/pamoletetitotujubuzet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6054/3138/files/wuvixazafowobinozipa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7976/1061/files/buvawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sabam.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/rewimolatelivosobiku.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/kogezufezexovedibuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/62793234012.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000afbf.bin
b310aa33b2e830d9b823386e85735c9cde2be2273f91eda70c70490affe3baac		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAFBF 8936 bytes
font_00_sfnt_off00009f4f.bin
fb290d63fb14cc1dea37dd799c73f703b82da83230805aaee75c6776b58ff01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4F 4872 bytes
font_02_sfnt_off0000c8e9.bin
15e4d98bbb2494cf093f1607ca721d7faf66a9744af90c1789d962eeea6b19dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E9 17000 bytes

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