Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99b4ed25ed86434…

MALICIOUS

PDF

40.3 KB Created: 2020-09-19 09:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a68e8fe818e0aa164b481fc4c214bc SHA-1: 411a9946ba24b6672363254153be90c416353f71 SHA-256: a99b4ed25ed86434d61be10d5c771c31d91427bf2e320bd5a583ac2216255295
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. It also exhibits characteristics of a PDF SEO link farm, with numerous embedded links to various PDF files, many hosted on Shopify. The document body, though partially corrupted, includes the target URL and mentions 'Myers psychology for AP PDF 3rd Edition', suggesting a lure to download or access malicious content disguised as an academic resource. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.club/wix?keyword=myers+psychology+for+ap+pdf+3rd+edition
    • http://files.mammothmosaic.com/uploads/1/3/0/9/130969389/dikagi.pdf
    • http://files.scarboroughcyclingfestival.uk/uploads/1/3/1/3/131398142/gepusirafafuma-mojox-nezejet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/zujugavesusileletejij.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/22235126894.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/6558486239.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/kinukaziv.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8675/files/future_will_going_to_present_continuous_present_simple_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/metal_forming_processes_and_analysis_b._avitzur.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/bullet_raja_movie_480p_mkv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/google_sheets_training.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/jelunuvutibun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/70242873321.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_off00005c18.bin
148adb215dcf03e37db66e7061e2f47f87c9f6fffe9fb81f67a4e95b9da92b18
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C18 5688 bytes
font_01_sfnt_off00006f8e.bin
06707d4b4ac8410f2a6a34557d64a31c21c77cacc5ba11758f4b227ab1355b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8E 10252 bytes