Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d9bd559438b8bd…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 14:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2fb8b7751bfcdd7f52d4df73c2172c0 SHA-1: 7918ad58c67d03ab714115aca57daf09b4117169 SHA-256: c0d9bd559438b8bd0d48d837000d4cc06af4a5932f7cd6378ec8e9be79ab35ed
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure (ttraff.com). Another heuristic flagged the document as a link farm, suggesting SEO manipulation or a distribution mechanism for further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector strongly suggest a malicious intent, likely related to SEO poisoning or redirecting users to phishing or malware sites.

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.com/pify?keyword=branches+of+political+science+pdf
    • http://zigopoz.barriegardenclub.ca/uploads/1/3/2/7/132740873/zurokafeduvila_folej.pdf
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdf
    • http://files.baschungshawls.com/uploads/1/3/1/3/131380107/7439960.pdf
    • http://zipitevi.ps251q.org/uploads/1/3/1/4/131406893/4664890.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/78380450586.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/60543709264.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wowivitotorinu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4322/files/tireridurebifanu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/vodozefifosiwozunosir.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/effects_of_drug_and_alcohol_abuse.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/648189685.pdf
    • https://cdn.shopify.com/s/files/1/0434/3051/0758/files/accountancy_project_for_class_11_cbse_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/9720610270.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8406/files/rememuzigerawaxufigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/doctor_application_letter_sample_pdf.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_off00006712.bin
0675354bdb174096f00f36448fc8f9bf557698b8eac179e898ee9dd3d22a0653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6712 5292 bytes
font_01_sfnt_off000078fc.bin
9f084736fbf0efd64b18bb208dff1c0660b52c8355acdab0b9b21fe0c903c3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FC 10176 bytes

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