Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c58d99fce42a8bf…

MALICIOUS

PDF

42.5 KB Created: 2020-08-27 15:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24647fb9206cf81353f170279b2a401f SHA-1: 5489d8514259e6d5b973b695f43961c7ec564c79 SHA-256: 1c58d99fce42a8bfccaccdfd754569cdfa7263753903c044998571e4da919e56
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.cc/pify?keyword=ecology+molles+pdf, which likely serves as a gateway to further malicious content. The document body itself is heavily obfuscated and appears to be largely noise, but the presence of the malicious redirector and the link farm heuristic are strong indicators of malicious intent.

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.cc/pify?keyword=ecology+molles+pdf
    • http://bokivibur.candiceblount.com/uploads/1/3/1/3/131382406/raviwozilidonup.pdf
    • http://potij.inticomposes.com/uploads/1/3/1/0/131070450/danejum.pdf
    • http://files.jacquifernandez.com/uploads/1/3/0/7/130740363/nebefofakekuvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/50008901066.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/gepema.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/99581029976.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7688/files/23931406736.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/26062094176.pdf
    • https://cdn.shopify.com/s/files/1/0428/9809/6284/files/bodybuilding_diet_program.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/balubojufevipejo.pdf
    • https://cdn.shopify.com/s/files/1/0459/9214/9154/files/wave_motion_in_elastic_solids_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/2161592944.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3162/files/dovaxozagosapiwusimu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2397/2005/files/pipekumuw.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_off00006afb.bin
a9df1a0899bb5b1e45c272ffae936e7c80f61dce6535784d531ea4079bf6b9f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 5228 bytes
font_01_sfnt_off00007cc8.bin
2ceba6a537c1b6f52451e3830ab9a42e0edbde622512c763aad8c3522256ebbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC8 9688 bytes