Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f3e04a81843995…

MALICIOUS

PDF

74.6 KB Created: 2020-07-31 07:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b43b98447d98c15495a53fe09d7a5768 SHA-1: 90ff176be0c2f1edf5aa3c71c90622f1c0c5e50d SHA-256: 17f3e04a81843995491b14a8dd92aa288d3f6fef5ef54bab5b51a3d87bed1fa2
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results for a textbook, but it redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious redirectors. While no scripts were extracted, the document's structure and embedded links suggest a phishing or redirection attempt.

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=calculus+and+its+applications+13th+edition+solutions+pdf
    • http://files.marsal-solutions.com/uploads/1/3/1/3/131379946/kinofowazavuwaropi.pdf
    • http://files.draytonparish.org/uploads/1/3/1/0/131070618/numagofalasumuv.pdf
    • http://files.iyengaryogacenter.com/uploads/1/3/1/6/131636990/c4288220374795.pdf
    • http://files.hemlockcompany.com/uploads/1/3/1/4/131482808/sugixiwafogebi_najiluret_tasotolo_liwirotawijug.pdf
    • http://files.vandenbel.com/uploads/1/3/1/4/131406222/8212891.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/69052868208.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wozofedotomutigetipire.pdf
    • https://cdn.shopify.com/s/files/1/0438/8130/0123/files/kisozerador.pdf
    • https://cdn.shopify.com/s/files/1/0428/4026/0775/files/zuzobutesesa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4167/5685/files/76264868996.pdf
    • https://cdn.shopify.com/s/files/1/0431/7875/4199/files/majifuberixotex.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/kubogiroxezusurotinok.pdf
    • https://cdn.shopify.com/s/files/1/0429/7805/0201/files/61798498026.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/romikapitiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/peneti.pdf
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/zipibegefimewaxobebopeguv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1596/1762/files/68721310406.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/97382721618.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5da.bin
f491981503280ee4a3f6097af808a5180d94f08b271a52767f41aef954a345a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 5268 bytes
font_01_sfnt_off0000e7c4.bin
487dcb03c7bfbd596987b517e7a8fb2d06e025437d3f60d189adc726a8d824f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 16500 bytes

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