Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c16638bd33e86c…

MALICIOUS

PDF

45.7 KB Created: 2020-08-31 13:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394fe3f088b695ac6e93311a93b77556 SHA-1: 9de6ff5b0c07d778edd2c1ee568f2ce866da4416 SHA-256: c8c16638bd33e86ce753e9f5642590d28b4e16256c5475430b7ca0560b4a8a82
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF was flagged by a machine learning classifier as malicious and contains a link to a known malicious redirector at ttraff.ru. Additionally, it features a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The document body contains garbled text but includes the malicious URL and several benign-looking Shopify URLs.

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=belt+conveyor+guide+rollers
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/59014598633.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/color_code_personality_test_yellow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/piwibi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/asme_b_pv_code_section_ix.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6715/files/pasexefoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/42329120398.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/66683412698.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/juwunadejix.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9023c3dfb24611a4b12272a3f8156f.pdf
    • https://static.usrfiles.com/ugd/7baf93_97cfc284ede04738b953a2940efd0ae1.pdf
    • https://static.usrfiles.com/ugd/67f5f7_7f82b73d2c814cf5a828c9bed8effe10.pdf
    • https://static.usrfiles.com/ugd/b8c837_cde6f7be8ae44dd7b0f8daee212e6ceb.pdf
    • https://static.usrfiles.com/ugd/b11f6d_f2d6b161263a4427b8465627204b844b.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_off000066d1.bin
c47bbec3e87b41d2e091d0ab4116d50cd50fdc0ef116f67bd7d1b621d4ab99fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D1 4988 bytes
font_01_sfnt_off000077e3.bin
8444249a6438744ea7672aaa2aef6274bc2f73e6281c9c339810b342385673ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E3 10428 bytes
font_02_sfnt_off00009b92.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B92 4324 bytes