Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b67f7c30d3b19a…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 279c12afd6e536e74e935befb1ebece0 SHA-1: 228af92c98fc735be06748b59826f8d12288073a SHA-256: 84b67f7c30d3b19a4e7e5829d90786f67c4ed3296878b2af78ffb6ca56bede1c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. Additionally, it exhibits a PDF link farm behavior, with numerous links to external PDFs, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several benign-looking URLs, likely part of the link farm.

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/wix?keyword=casa+vieja+ceiling+fan
    • https://static.usrfiles.com/ugd/2c8d66_97399763cb63447c8626b93747417b22.pdf
    • https://static.usrfiles.com/ugd/7baf93_e45c17b010e0461eb7ff06d2dd78ad6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_01fac31c07364ba190484afae6da9376.pdf
    • https://static.usrfiles.com/ugd/067ecb_95a25567a62b419283153219d0423da6.pdf
    • https://static.usrfiles.com/ugd/158fb9_17d5ace646c14d72917245950cc0e619.pdf
    • https://static.usrfiles.com/ugd/b8c837_de4b68173cf7430ba8f07f3740fed396.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/mesixusopeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/fosroc_expandafoam_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/15544526088.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/35951724701.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0147/files/59536237272.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/red_cross_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/87537166269.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e83.bin
c4ccccb71e136e3e2e6c77b0ce80647042bf41e7580747dd41fe129f834ff603
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E83 4712 bytes
font_01_sfnt_off00005e9f.bin
f6b816e252af7ab19a78f7fb1b6125dc21525cce1e6e03f0b6faa1879d6fc369
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9F 10460 bytes
font_02_sfnt_off00008246.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8246 4324 bytes