Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7c68671139cb49…

MALICIOUS

PDF

41.1 KB Created: 2020-09-04 23:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3824974da9858d1cac898539ee324e13 SHA-1: e2c98c430069f232a822595f0cfe5ed5f46fc3b0 SHA-256: ae7c68671139cb4917179ecadb199959a6db5bab0e1b251509eabd67ba05d9c3
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.me/wix?keyword=best+bike+racing+games++for+android', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a coordinated effort to drive traffic to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=best+bike+racing+games++for+android
    • https://cdn.shopify.com/s/files/1/0432/1817/4120/files/small_android_cell_phones_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0436/8039/9510/files/rinupojalusixiziserawumow.pdf
    • https://cdn.shopify.com/s/files/1/0444/3645/5591/files/dazulubasatarasolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2913/4501/files/xugepafivorozotutibosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/misplaced_modifiers_examples.pdf
    • https://cdn.shopify.com/s/files/1/0462/2988/0981/files/fajijilinixajetu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3883/files/nufadelalojin.pdf
    • https://static.usrfiles.com/ugd/b8c837_a47a680e4ec94322a405f54667ff81ba.pdf
    • https://static.usrfiles.com/ugd/0286dd_48944db525e642d9b110586853cc1351.pdf
    • https://static.usrfiles.com/ugd/87b9a8_587ebec92f484db48bf6ee369207fff5.pdf
    • https://static.usrfiles.com/ugd/b4a829_29dd39d717294f0c91d88d36b7d2d347.pdf
    • https://static.usrfiles.com/ugd/d79848_d5319eeb37ad4d3eac1664b5eb00c232.pdf
    • https://static.usrfiles.com/ugd/0d089b_4e412c4b77d9418a89bf81fb5008f853.pdf
    • https://static.usrfiles.com/ugd/b8c837_5097ae9a06ab421aaeccb800d9fed630.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_off000062ae.bin
e83a823618dd5841d3221896bb01d431d90bd5e67f267521f068c3081b43b344
pdf-font-stream PDF embedded font (sfnt) at offset 0x62AE 5564 bytes
font_01_sfnt_off0000758b.bin
9a69cad1925b4d014cc0fa47896887839bb0db38ced1facdecea3c037cb7154b
pdf-font-stream PDF embedded font (sfnt) at offset 0x758B 10024 bytes