Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f19df1e8fa41102…

MALICIOUS

PDF

33.4 KB Created: 2020-08-25 23:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc3de1048da0dc8a5e2fec7138efa166 SHA-1: 82407a2d835f6ba84d261f657a5aab11f90e623e SHA-256: 4f19df1e8fa41102b159376427702c7daa765e0bc0857a8b343cba481c6daf60
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same redirector URL and several Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to malicious sites via embedded links.

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=draw+with+jazza+easy+anatomy+pdf
    • http://files.greenadaptations.net/uploads/1/3/1/6/131606490/9745017.pdf
    • http://gitid.nucec.net/uploads/1/3/1/3/131398091/selerujulox.pdf
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/tiwalivunuwipab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5408/8871/files/77456486241.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12457093378.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/gominesetatilonul.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/13931720523.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/binary_addition_rules.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/62292810486.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/34387806545.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/byomkesh_bakshi_series_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/nobody_s_perfect_lyrics_hannah_montana.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/20652194760.pdf
    • https://cdn.shopify.com/s/files/1/0462/3925/2631/files/ankhon_dekhi_720p_full_movie.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_off00004357.bin
70900d46c25d9abea986adb3f9e9cda9917fb955607832c4053458843015e885
pdf-font-stream PDF embedded font (sfnt) at offset 0x4357 5568 bytes
font_01_sfnt_off00005644.bin
4686226a8b593b290d1142395a57b26058c72e5daadc866dea9a4af0312061ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x5644 10136 bytes