Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4dbbb2296a3c49…

MALICIOUS

PDF

39.7 KB Created: 2020-08-22 14:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161e8544a42e80dcd9a36e81f89cc3a3 SHA-1: 5b0b0a5f234649c9c72d14bca6f8725c5598e5e6 SHA-256: 9f4dbbb2296a3c49c07df24fba42ff475207b1355741e3946e6c90b6da25d285
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm. The primary attack pattern appears to be a link farm designed to either manipulate SEO or redirect users to malicious 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.ru/pify?keyword=aesop+rock+labor+days
    • http://files.bingocompany.net/uploads/1/3/1/3/131379612/d2857f2095895b.pdf
    • http://lupurix.interiordesignmadesimple.co.uk/uploads/1/3/1/6/131606490/mosusixepifituzog.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/nivasivofiminilaji.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/92727564261.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/duverugojitazuderuwug.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/kiketozudukedidegamesi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/canon_eos_7d_mark_ii_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0444/3065/5655/files/sowapanetag.pdf
    • https://cdn.shopify.com/s/files/1/0433/3440/2216/files/adobe_acrobat_reader_setup_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/bilingual_education_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/94490461806.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/61078799425.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8954/files/30251280586.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_off00005e23.bin
2f04fabcdb8889fcedccb2208a7238c51a93f6cd32a43686621609276b3c41dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E23 5364 bytes
font_01_sfnt_off00007069.bin
fb906253db25a5ac61c4c6d77a72d2457d4019d67479235eee09e193d12c5a06
pdf-font-stream PDF embedded font (sfnt) at offset 0x7069 9884 bytes