Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3276089b2df2575…

MALICIOUS

PDF

41.7 KB Created: 2020-09-03 20:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 255e4d0f7d895f16ae4e16a54117c1e2 SHA-1: 22ee3fad45b075b2315a50f1c2a6c9c61166ac2c SHA-256: a3276089b2df2575cf2898c432ba0cfb569abc3a0da9ea0546281a1a80cea449
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a question about Google Sheets. This link leads to a farm of other PDF files hosted on Shopify, likely as a means to obscure the ultimate malicious destination. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead the user to harmful content.

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.link/wix?keyword=can+you+insert+images+into+google+sheets
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/wikanutuweluwivoloji.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/xotimolipeviwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/todakuzibomisexenen.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/lekawukodino.pdf
    • https://cdn.shopify.com/s/files/1/0465/9429/3925/files/edinburgh_haymarket_platform_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/boruxunijutaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/0524/7647/files/strategic_planning_tools_and_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/72970283030.pdf
    • https://cdn.shopify.com/s/files/1/0431/8927/2725/files/email_examples_for_business_communication.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/puwutedefetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9174/5175/files/wizufezino.pdf
    • https://cdn.shopify.com/s/files/1/0462/7274/1525/files/free_games_for_nintendo_64_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/argumentation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/linkedin_phishing_email_template.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_off00006582.bin
7a77ac6127edd538804ecc24b725bc989d1a2586eadf3026fce898b1fe1bf96d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6582 5104 bytes
font_01_sfnt_off000076b8.bin
df6695ef5e5bedb6c2a59246cc53618cf09d9dc4d05f629e8b66f395408d643c
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B8 10264 bytes