Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef1c6a14755985d…

MALICIOUS

PDF

50.9 KB Created: 2020-09-01 10:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28815d5f847e1510e25ada7d3b1aef7b SHA-1: b62ee3fc6d6d354f79880f20730962ebfff64282 SHA-256: 3ef1c6a14755985d753284937c6b1848d8c37d04ef25ecd9005db7862d6bf157
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=picador+de+vegetales+manual'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to other Shopify-hosted PDFs, suggesting a coordinated effort for phishing or malware distribution.

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=picador+de+vegetales+manual
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/ratejekobivajij.pdf
    • https://cdn.shopify.com/s/files/1/0437/6841/4370/files/novusemalireletaweja.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/45100346338.pdf
    • https://cdn.shopify.com/s/files/1/0432/7935/1968/files/vlc_media_player_vlc_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/33821313618.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/fiery_furnace_tour_guide.pdf
    • https://cdn.shopify.com/s/files/1/0471/0642/4982/files/catalogue_ikea_2017_france.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/amaurosis_fugax_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0434/0305/1171/files/42550179028.pdf
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/15_minute_binary_options_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0432/0624/6557/files/936874977.pdf
    • https://static.usrfiles.com/ugd/19103d_f30d2bb8ca5c493c9e1f78944f28cd63.pdf
    • https://static.usrfiles.com/ugd/b972d5_813cf22415ec4c1aa20a34b4c70082cc.pdf
    • https://static.usrfiles.com/ugd/7f16bd_1ad6f3445e90496fbac9f43c8be9bc29.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_off0000848a.bin
022c587ce59dbb1f8a833d0ce798cc10a84e54539ac93fe434c6fb5e6adc7592
pdf-font-stream PDF embedded font (sfnt) at offset 0x848A 5320 bytes
font_01_sfnt_off00009694.bin
8a78f4fcc32803f4c0c751550baf1b4fbc5d5dccc8af5dc026dc2c498f6ecba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9694 11912 bytes