Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b51cd171fe447e…

MALICIOUS

PDF

38.1 KB Created: 2020-08-24 16:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 388740900d7932dca1a72f361a5a68cd SHA-1: 80ea5092f14f8fc82b8e2de7fa3951dee4280bbd SHA-256: 35b51cd171fe447e3bad9d5abb05cae404ff3f40356fa5181d8805ced8f16aaf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to deliver further payloads or lead users to phishing sites. The document body, though heavily obfuscated, contains the same lure text and URLs as found in the heuristics, suggesting a social engineering attempt to trick users into clicking the malicious link. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination.

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=hanuman+vs+mahiravana+full+movie++openload
    • http://tukij.gretchenc.com/uploads/1/3/2/7/132740805/xejomoxuk.pdf
    • http://files.pentepoets.com/uploads/1/3/0/7/130740364/wivolimivuza.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/14153262170.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/centric_jaw_relation.pdf
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/botanical_colour_at_your_fingertips.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4890/files/fokag.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/17498998733.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/financial_accounting_journal_entries.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/85893469425.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/megudasoziwupob.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/aindra_prabhu_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/lepekupirezaxenapix.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/xudaxolijixos.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_off000056e1.bin
774de7bbdf8c554f924f76e0dc4e14826ab8cc794779e5170b2042943d8e0c00
pdf-font-stream PDF embedded font (sfnt) at offset 0x56E1 5304 bytes
font_01_sfnt_off000068bc.bin
5f171ecc61b3b522f0eeef14e4940fd6bae6c91b60eaebaa81762e7284ba6fb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x68BC 10356 bytes