Malicious PDF — malware analysis report

Static analysis result for SHA-256 b766ecd1e82e42b9…

MALICIOUS

PDF

42.5 KB Created: 2020-09-01 12:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32098af88fd3a59ab77f89313e3cd0be SHA-1: 2089417169a19cd0bbb702b6efeedc6e035bd523 SHA-256: b766ecd1e82e42b9644bbb8d113e6725a6d0de5a614fdb81824c49414b2e08ce
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, ttraff.com. The document body, though heavily obfuscated, appears to be a lure related to guitar chords. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier strongly flagged this PDF as malicious.

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=guitar+barre+chord+cheat+sheet
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/35914779787.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/33023281994.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9585/files/weight_lifting_workout_log.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/xitegopokajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3187/1139/files/all_creatures_great_and_small_james_herriot_free_download.pdf
    • https://static.usrfiles.com/ugd/a64c8c_4dbc33ee3f6c4ec28eabd310a53aba6c.pdf
    • https://static.usrfiles.com/ugd/f63f29_2a7daad172f54ab48d157066e4ccd7a5.pdf
    • https://static.usrfiles.com/ugd/1849a1_d19e90171f534a76b0f03e733f3612ef.pdf
    • https://static.usrfiles.com/ugd/cafc24_16baa1bceee6498b962126f68755a698.pdf
    • https://static.usrfiles.com/ugd/b8c837_396b74fddcfa4f3ea21613a5cf13104d.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_031b6c5a781d4f599d6f48697837fc82.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_7badf1cf7d5f40579222b0d551b001a3.pdf
    • https://cdn.shopify.com/s/files/1/0436/7620/5209/files/ap_grama_sachivalayam_notification_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/yamaha_waverunner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/psychology_big_ideas_simply_explained.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/
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/xite

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663b.bin
2627613d139cc20b36de6b56d62c30e812ee4e38611695a5616c138e15788e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x663B 5164 bytes
font_01_sfnt_off000077be.bin
c7231242256215f75c89c4d61e3765de28ef07c889de7fee7af9c594ab47dde6
pdf-font-stream PDF embedded font (sfnt) at offset 0x77BE 10852 bytes