Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8527b25adf9973…

MALICIOUS

PDF

45.2 KB Created: 2020-09-01 00:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa522df2a3c7d0a0c4b0f29016a75758 SHA-1: 480a2962dccb2f5d7f62f5de26fe9656b23944f5 SHA-256: ad8527b25adf9973b85af5f0631d27a294b372c56bcd39e3d4cce1d4b598c83d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link that points to ttraff.ru, which is known for distributing malware. The document body, though heavily obfuscated, contains the URL and keywords related to the Android Google Play Store, suggesting a lure to trick users into clicking the malicious link. The PDF also hosts a large number of external links, many pointing to Shopify, likely as part of a link farm to improve SEO for 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/wix?keyword=android+google+play+store+open
    • https://cdn.shopify.com/s/files/1/0431/5620/9819/files/92671739944.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/jiwaxevilot.pdf
    • https://cdn.shopify.com/s/files/1/0433/1762/4987/files/pdf_rectangle_annotation_tool.pdf
    • https://static.usrfiles.com/ugd/c63dba_b52e5c67f4634db194cc754ca42bbd91.pdf
    • https://static.usrfiles.com/ugd/921909_e0f8ff9d46864ef69d039e5443908a08.pdf
    • https://static.usrfiles.com/ugd/89363e_fd71b36986ea4f038b76a2a0239d7e97.pdf
    • https://static.usrfiles.com/ugd/0779a3_9bfc072ab93f49c39e23c789cba1a724.pdf
    • https://static.usrfiles.com/ugd/bae363_de5ce1bbacdd4e049b63b5dd58ba3288.pdf
    • https://static.usrfiles.com/ugd/2b3f46_0828f964b30c4ac181d19bb9ab697904.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb372ff0ee1348b0aebb87c1f0f29cec.pdf
    • https://static.usrfiles.com/ugd/269bb8_9d05a0b3fce7428b8cf4b2c8e91c4f13.pdf
    • https://static.usrfiles.com/ugd/b8c837_e86c1ba6912e4f088a366665e774bc29.pdf
    • https://static.usrfiles.com/ugd/b8c837_831429a911fb4c8d8575bd1f4600c878.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_off0000722e.bin
b1a44a901811aef02ec152ba7ee831076174c5518b159a9a34bbed4274cb86c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x722E 5220 bytes
font_01_sfnt_off00008405.bin
bb6467811ffb3ed15b05875f060506424ab523a3b7bb80d09fc998c53d3a7010
pdf-font-stream PDF embedded font (sfnt) at offset 0x8405 10512 bytes