Malicious PDF — malware analysis report

Static analysis result for SHA-256 1939c6fa092f75cf…

MALICIOUS

PDF

43.3 KB Created: 2020-08-09 14:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6d51e8f0976b7de34a65072f6a5b1b4 SHA-1: a70426020665bf3b67ec878d314525bd5be0d22c SHA-256: 1939c6fa092f75cf986d7983ee754e55a8b262441f1539dcb5b8610deaf0697e
154 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous embedded links to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The primary malicious indicator is the link to `ttraff.ru`, a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external resources. The ML classifier strongly flagged this sample as malicious.

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/pify?keyword=appsc+group+1+previous+papers+pdf
    • http://files.180degreefinancialcoaching.com/uploads/1/3/0/9/130969744/d6ced7.pdf
    • http://files.walkingmeditation.eu/uploads/1/3/0/7/130739616/dewitadudibokes_jomameroxizeko.pdf
    • http://files.englewood-umc.com/uploads/1/3/0/7/130775334/6453165.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3476/2664/files/443856616.pdf
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/adjective_or_adverb_exercises_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/pinoxifurijar.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/540_2ez_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/fasapafadijipivibogete.pdf
    • https://cdn.shopify.com/s/files/1/0438/8113/6296/files/dynamic_business_law.pdf
    • https://cdn.shopify.com/s/files/1/0428/5300/7516/files/nezigaregixezopox.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/jupabupetefizu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6978/2693/files/2069102887.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/how_to_change_discord_font.pdf
    • https://cdn.shopify.com/s/files/1/0437/9928/1821/files/jimmey_sweeney_cover_letters.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_off000061c9.bin
6b28db3f3eb1b2e399319215f2798edeeebea207b5875229e6d07d03f32cd1a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C9 5392 bytes
font_01_sfnt_off00007442.bin
6aab5b67cb0cd67bff68a09abe6f6f7ddd1de62d2bd9d9942ebd0eb4f127bb28
pdf-font-stream PDF embedded font (sfnt) at offset 0x7442 14428 bytes