Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc849f4098251e86…

MALICIOUS

PDF

37.4 KB Created: 2020-09-02 20:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3312a3d52dcfc9b2d15e045439c1a788 SHA-1: 97415e473ab431b8e6adb4cbc20dca8b746c61b2 SHA-256: bc849f4098251e869ab8492ebe8da1a38be89cf92f2089a893a6a1d9a3a2ac53
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs. The presence of multiple PDF links, many pointing to Shopify, suggests a link farm intended to distribute malicious content or SEO spam. The primary malicious URL is ttraff.me, which is a known redirector.

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=surfin+usa+trumpet+music+sheet
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/metformina_850_usos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57308776079.pdf
    • https://cdn.shopify.com/s/files/1/0429/1847/7987/files/wonatibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/fundamentals_of_engineering_electromagnetics_cheng.pdf
    • https://cdn.shopify.com/s/files/1/0437/8266/8437/files/fonuratasekeruwabuba.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1712/files/linatimafej.pdf
    • https://cdn.shopify.com/s/files/1/0435/8891/1267/files/vodimemoko.pdf
    • https://static.usrfiles.com/ugd/2d797c_38565b96600846e9bda1b5a8ce5b71fc.pdf
    • https://static.usrfiles.com/ugd/8c0e65_bd1f883cccd4434e8a62e481c3f7d435.pdf
    • https://static.usrfiles.com/ugd/77941b_d3db8a9fb55c499380f94d3880e0d33c.pdf
    • https://static.usrfiles.com/ugd/0dd040_ad5495a3bb474db18ee9d4a06348815c.pdf
    • https://static.usrfiles.com/ugd/ae15ca_c695d9235fe94f27a789a174c0368a3b.pdf
    • https://static.usrfiles.com/ugd/41f880_18eb1cc8a9a64e739b3ba636d25eaa6e.pdf
    • https://static.usrfiles.com/ugd/7ff653_ab4f8a3baab043dfb4032c5e12c23b7e.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_off0000470c.bin
3da3f4a6c538d6e79dacaae0449352813e1910da789930eb6892b4a3e922dea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x470C 5100 bytes
font_01_sfnt_off0000582c.bin
ce92a8db7753490e9cd20714b7dcf937072fbd7c2d3231ec9b1ae0a4f937ce60
pdf-font-stream PDF embedded font (sfnt) at offset 0x582C 10104 bytes
font_02_sfnt_off00007ac8.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC8 4324 bytes