Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4c67730d98826e…

MALICIOUS

PDF

47.6 KB Created: 2020-08-20 01:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1cde7151703da741a6b4605688ab5ed SHA-1: a468a3e25d434c3920f7c318f392f7178b4a9732 SHA-256: bc4c67730d98826e839fae33214eea5d3d503e3ee8188e420cdfb43f11025bef
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.ru/pify?keyword=berberian+sound+studio+movie, is flagged as a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious websites, likely for phishing or malware distribution.

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=berberian+sound+studio+movie
    • http://files.mhcs.me/uploads/1/3/0/7/130775652/fonuwidumajovuxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/sapizab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/dabedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/antiphospholipid_antibody_syndrome_review.pdf
    • https://cdn.shopify.com/s/files/1/0443/8504/2598/files/sap_accounts_payable_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/65474276244.pdf
    • https://cdn.shopify.com/s/files/1/0462/2109/9162/files/66561590543.pdf
    • https://cdn.shopify.com/s/files/1/0436/7309/2246/files/38146228581.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/kevupifipoja.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/pagowa.pdf
    • https://cdn.shopify.com/s/files/1/0436/6378/6137/files/legitimate_interest_analysis_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/mavaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/piguwubisotezovizekitetev.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/getutiwatafimobasurugewow.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_off00007bd6.bin
bd6203b05079eb118ea17fccb030a430da30a6325dd51c51394d818cdc43b034
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD6 5188 bytes
font_01_sfnt_off00008d5c.bin
74e112e4f5daed96f9dad1dadc4af58e8b24a90846a6ad09faf56a6adf065a01
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5C 10816 bytes