Malicious PDF — malware analysis report

Static analysis result for SHA-256 74096dacbeef2c3f…

MALICIOUS

PDF

44.9 KB Created: 2020-08-07 07:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889fafa56276adac070b2f1136bff762 SHA-1: b132b606dbdb879d932c2bede0c59c83b8847707 SHA-256: 74096dacbeef2c3fd647547fd46a1472c27124fdb59e03b2928ec0cf1aff9598
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, disguised as an IELTS answer sheet, redirects to malicious infrastructure at 'ttraff.cc'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves social engineering via link manipulation.

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.cc/pify?keyword=ielts+writing+task+1+and+2+answer+sheet+pdf
    • http://files.j2theson.com/uploads/1/3/1/4/131453847/pomado-lebigizilifefi-jenovixuxa-joziku.pdf
    • http://files.unnatinarang.com/uploads/1/3/1/0/131070212/3238589.pdf
    • http://files.flyingelmer.com/uploads/1/3/1/1/131163960/mugotiv.pdf
    • http://files.theyogaschoolny.com/uploads/1/3/0/7/130775942/668541.pdf
    • http://files.exsanguinationsignet.com/uploads/1/3/2/7/132712483/bogululuvaxafogime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0138/7936/files/32907421049.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4375/files/jerofilejajibulakemot.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/calendario_2020_con_festivit_italiane.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/list_of_pokemon_by_national_dex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31443612403.pdf
    • https://cdn.shopify.com/s/files/1/0430/4125/9671/files/august_2020_current_affairs_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7727/files/12319595456.pdf
    • https://cdn.shopify.com/s/files/1/0437/8427/4081/files/54123139093.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/how_to_mod_a_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0433/5766/7487/files/mcgraw_hill_4th_grade_math_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/munuxutumiwimisaluga.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_off00006f80.bin
adef52269d74ec05c9eca0a7e583ae6122ddcceec67b4652488c0b9dc0262620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F80 5580 bytes
font_01_sfnt_off0000828f.bin
ead637e82b322a80c97771f74342f4eefb71d632d6ea88429fd3c18eaceb679e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x828F 10740 bytes

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