Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff1189ee1dcab78…

MALICIOUS

PDF

35.0 KB Created: 2020-08-21 03:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d158121b97183f8599ba1ec83157d69e SHA-1: 1c515485f0c1607860ea70b20340e831f288e5c0 SHA-256: 8ff1189ee1dcab78663f8cb0f25cb54d035e67c981b8e2771f666426d77c2a5a
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=deadpool+2+trailer++in+telugu, which is the primary indicator of malicious intent. 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.ru/pify?keyword=deadpool+2+trailer++in+telugu
    • http://files.oakfamilycounseling.com/uploads/1/3/1/8/131856212/muviriledexegomuxo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/88249136029.pdf
    • https://cdn.shopify.com/s/files/1/0430/3860/5461/files/lojejepafojejelid.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8136/files/expanded_form_math_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/96498853633.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/kulep.pdf
    • https://cdn.shopify.com/s/files/1/0431/8248/9762/files/73778888917.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1352/files/25166545003.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/dd_form_1380.pdf
    • https://cdn.shopify.com/s/files/1/0440/5064/5157/files/categorical_data_analysis_with_r.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/12519663378.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/fusakorifopuro.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_off0000404f.bin
b3a29494ef77101a637b079f4be646a4f906e1bc7a49c66c441c771e68e0240a
pdf-font-stream PDF embedded font (sfnt) at offset 0x404F 4964 bytes
font_01_sfnt_off0000513b.bin
9ed238b5c6293636458cf628e6025b6e5278158c0e411252697b830c77f1b06e
pdf-font-stream PDF embedded font (sfnt) at offset 0x513B 9416 bytes
font_02_sfnt_off00007187.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7187 4324 bytes