Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0ca37fc83aa449…

MALICIOUS

PDF

45.5 KB Created: 2020-08-06 13:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1373d4706dae6c21bddf1789c3f4199 SHA-1: 39b56d572900cb7067b6f9f9c9f4c43d99da7b86 SHA-256: 4e0ca37fc83aa449c60be57764890d68cb784c272370cb3568e0a64da82e508d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. 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=%25C3%25A9nergies+renouvelables+pdf
    • http://files.geras.sk/uploads/1/3/0/7/130739117/sadafagof-gewuba.pdf
    • http://files.maineeastlibrary.com/uploads/1/3/1/8/131872032/maruvipep.pdf
    • http://files.thechurchtaxexpertsofamericallc.com/uploads/1/3/2/6/132682327/76355.pdf
    • http://files.sjcnl.ca/uploads/1/3/2/6/132681303/pisoropole.pdf
    • http://files.luismojica.com/uploads/1/3/1/6/131606803/difowamabitukibe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/bazamexisowusipabidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/3354680371.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/sound_of_silence_ukulele.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3846/files/69733418300.pdf
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/zumotedikokeme.pdf
    • https://cdn.shopify.com/s/files/1/0436/5467/6645/files/ps3_controller_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/41289693502.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0818/files/94237684606.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/wuzokemuxesoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/67923410868.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7451/files/stellaris_name_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19463184481.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_off00006eec.bin
64e4b1c7dd988a663df52e45a76db293f2be979eeb2d2f17866a85a73013a516
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEC 5388 bytes
font_01_sfnt_off0000815a.bin
665764cda919dc725b851efaf653628afb0b4b9a4ab9266c797e1b8b164d101e
pdf-font-stream PDF embedded font (sfnt) at offset 0x815A 12168 bytes