Malicious PDF — malware analysis report

Static analysis result for SHA-256 babbb6beadc4e911…

MALICIOUS

PDF

47.3 KB Created: 2020-10-27 15:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 321fe40c06204df41df3f27a1a3d0550 SHA-1: 989f75d394573a5d52fab1cd46521e285f5cafb0 SHA-256: babbb6beadc4e911054e194514beff893a9efa946948e4ffe1172e60186fb59a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One URL, 'https://ggtraff.ru/pify?keyword=interpreting+a+human+pedigree', is flagged as a malicious redirector. 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://ggtraff.ru/pify?keyword=interpreting+a+human+pedigree
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/c25f730.pdf
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/8467864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0479/6694/5447/files/paweramomapugesid.pdf
    • https://cdn.shopify.com/s/files/1/0502/1535/4543/files/cheapest_android_phones_to_buy_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0505/9294/0200/files/55570343911.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6773/files/momapifutirir.pdf
    • https://cdn.shopify.com/s/files/1/0504/9342/3808/files/baboroxef.pdf
    • https://cdn.shopify.com/s/files/1/0501/0279/6464/files/paduka_books_for_ca_final.pdf
    • https://cdn.shopify.com/s/files/1/0481/6604/3801/files/s_and_j_engines_better_business_bureau.pdf
    • https://cdn.shopify.com/s/files/1/0480/6603/5876/files/78413760949.pdf
    • https://cdn.shopify.com/s/files/1/0481/6666/6389/files/43643445799.pdf
    • https://cdn.shopify.com/s/files/1/0477/5228/2268/files/steelpix_stemming_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0479/4148/4700/files/84777314402.pdf
    • https://cdn.shopify.com/s/files/1/0487/7248/1190/files/spanish_1_definite_and_indefinite_articles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0479/7569/4492/files/koraxukajegenimitatifaku.pdf
    • https://cdn.shopify.com/s/files/1/0432/6444/2521/files/gadawibafuzalabipeb.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_off000079f5.bin
35d0019cae2e904acc55f8c719e8dd776a1cd31743a49dc94fb306bcc0b00bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F5 5100 bytes
font_01_sfnt_off00008b18.bin
07518ec2cd7b4c5a71e7c11c80199ada203fd01b131ab80ac8ae23223435a422
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B18 10860 bytes