Malicious PDF — malware analysis report

Static analysis result for SHA-256 c228198fa0817ed3…

MALICIOUS

PDF

36.1 KB Created: 2020-08-08 10:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c33ebaa81c32dc7bd1ff271d8afc24 SHA-1: 6bc455d5dd54ff9b8fa5a26275d117eaa3a28697 SHA-256: c228198fa0817ed3afd8f1653464ac9c17b6da214206e8affb4afdb3399a4578
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to Shopify domains, which is characteristic of SEO poisoning or link farm techniques. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious redirector.

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.com/pify?keyword=bsp+and+bsw+thread+chart+pdf
    • http://files.artofbriannakenney.com/uploads/1/3/0/8/130874110/1261170.pdf
    • http://files.encorect.org/uploads/1/3/0/9/130968961/podoxelosa.pdf
    • http://nitufemo.kathshiatsu.co.uk/uploads/1/3/0/7/130776394/f2a00d64.pdf
    • http://files.reformationocconference.com/uploads/1/3/1/6/131637529/kewifexakasawizufu.pdf
    • http://files.foothealthpractice.com/uploads/1/3/1/0/131070597/6b7e6187a.pdf
    • https://cdn.shopify.com/s/files/1/0429/7192/2591/files/ruvafaxivuwizatim.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/grand_central_terminal_map.pdf
    • https://cdn.shopify.com/s/files/1/0440/1407/6069/files/mhgu_insect_glaive.pdf
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/nafovekizazor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/5440949933.pdf
    • https://cdn.shopify.com/s/files/1/0434/5616/8093/files/9668277228.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/52927431448.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/wilumojuzidopote.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/42538257445.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/pukovaxutekenumin.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_off00004ea1.bin
1542a697fd1ca1965ebb3a1e61c64d6bc9766a78078eaa0f5383c2b4d7fda539
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA1 5492 bytes
font_01_sfnt_off0000615d.bin
150fa79dc36b82136a1040e3a045a8b2788bb2a6b815d60f108d5dae581faaf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x615D 10052 bytes