Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ca7a6555640674…

MALICIOUS

PDF

42.1 KB Created: 2020-09-01 12:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2fdaabaf9ac69313a9b89057f143850 SHA-1: 5dbcf33f2fe051f5e2917794b013d6e72259b1bb SHA-256: 13ca7a655564067436e08c8fda1e1c1c66aeed53d6600ceaff95b195254c835a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, forming a link farm. One of these links, https://ttraff.ru/wix?keyword=alarm+clock+program++free, is identified as a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, and the document body was heavily obfuscated.

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=alarm+clock+program++free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/gettysburg_address_text.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/56458508828.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/44626275715.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4734/files/nowudurefax.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/capitulo_miercoles_11_la_reine_du_fl.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d67ec2f2de2477b96a9c3a4be8db334.pdf
    • https://static.usrfiles.com/ugd/5438e3_c14dd1739cf648ce99c623251c8e0cba.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4ba8171509a4c869d6f9fde141a7804.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_ae614dd337744ac8b64aa72346633626.pdf
    • https://static.usrfiles.com/ugd/a1fb72_c867ccaeb70a478d9c2970f677f9925a.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/informal_letter_writing_format.pdf
    • https://cdn.shopify.com/s/files/1/0429/9613/8137/files/mobile_phone_repair_course.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1706/files/aircraft_registration_form_8050-_1b.pdf
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/zunudigukatoxezeviluk.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000630b.bin
371ea980af1315084a1d9f2c96d7cca2e3cd4ba9516953b56f14dca4cf38d6c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x630B 5208 bytes
font_01_sfnt_off000074b4.bin
533244c4de21474926c08efddc56ea6f6323521d1af94fab6832e00dec6be8f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B4 12252 bytes