Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c0552ff9c5c7b3…

MALICIOUS

PDF

39.5 KB Created: 2020-09-08 12:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 370dbcddcb5e78dedcccd02dc1e1976c SHA-1: 2aa37d34012e869fb6c9d2f0ee353b6b930ee974 SHA-256: 59c0552ff9c5c7b3854cdba5be34213cde33be6b79808dc650f3ed9f118eb6dd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.link, which is likely the primary malicious payload delivery mechanism. The document body contains obfuscated text and the malicious URL, suggesting an attempt to disguise the malicious intent. No scripts were extracted from this sample.

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.link/wix?keyword=supervisor+performing+bargaining+unit+work
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/flower_background_hd_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/mozilla_new_toeic_actual_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0282/files/fight_song_piano_sheet_music_printable.pdf
    • https://cdn.shopify.com/s/files/1/0440/7122/3446/files/hamburger_helper_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0435/9965/9176/files/tifolixepagevap.pdf
    • https://static.usrfiles.com/ugd/762c1a_3dae70484fe74802a92612e9bf4ea949.pdf
    • https://static.usrfiles.com/ugd/19103d_f3c507351e58463090f263c24fb49719.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/cuisinart_coffee_maker_clean_button.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/geguwawukuxesopazutoziso.pdf
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/tusiwasolesirilezasok.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/24110359835.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/beiimaan_love_film_hd.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_off00005c49.bin
2a7c2705a0dac3398e4688012f81f60e1e487c8b35358457e6d04d29ceca25dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 5648 bytes
font_01_sfnt_off00006f80.bin
84b03a82ce900038f065dd8e5d9d7d21ab654a67609b1c6f044fe28d22dfe3f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F80 9948 bytes