Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa61ad43449d5ec…

MALICIOUS

PDF

38.1 KB Created: 2020-08-30 16:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e589eb7cfbd46db6ebb78a217e1c48d5 SHA-1: e6ba5d8a82de8a7f288b5cef37d0c55c4140bf41 SHA-256: bfa61ad43449d5ec8038cbf1e2f25fdb810438c547f679080b2f8aae70c91406
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, however, redirects to the malicious domain 'ttraff.com'. This suggests a link farm designed to obscure malicious activity or to distribute further malicious content. 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.com/wix?keyword=hateno+village+goddess+statue
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/13737006541.pdf
    • https://cdn.shopify.com/s/files/1/0438/4364/9698/files/xefetelobolujopijozizeso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/26592821281.pdf
    • https://cdn.shopify.com/s/files/1/0428/2882/4742/files/achilles_repair_rehab_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/76458403831.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2613/files/50948883362.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/convert_website_to_on_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0429/2889/8211/files/million_dollar_listing_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/9689/0785/files/ejercicios_clases_de_sustantivos_4_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/41691958603.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8424/files/3829451325.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/xemoditavodasaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/english_grammar_modal_auxiliary_verbs.pdf
    • https://static.usrfiles.com/ugd/b8c837_608b274125884702a3938e1ac8db3600.pdf
    • https://static.usrfiles.com/ugd/9e41f0_47c52c157c1a4057bfc247355b7cb2c5.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_off0000580c.bin
a5406cb599f2009bbd3124578640f74128b39587e799376f517c1885ff100d0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x580C 4920 bytes
font_01_sfnt_off000068de.bin
976fcbbf60ea8718a9951ffc428b061b789257efda87e1a2ea545efc997d87b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DE 10088 bytes