Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99d46efd12afc6e…

MALICIOUS

PDF

42.8 KB Created: 2020-08-25 00:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df2d44b25b31393af4483212da6dbff SHA-1: f2c7953b1240d98688d273fe9aa0ed8652b78db2 SHA-256: c99d46efd12afc6e7316c175d978f79eb8ddb0785073c0594bdecc1cce8dd1a3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains text related to 'narrative essay outline template' and the malicious URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=narrative+essay+outline+template
    • http://files.welleyofficial.com/uploads/1/3/1/1/131164431/bakukewejatas_fekugizajenudom_puligisibizume.pdf
    • http://files.blakesburgchurch.org/uploads/1/3/1/4/131407898/7bad87e.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/axfood_rsredovisning_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/sifebodetuxifiro.pdf
    • https://cdn.shopify.com/s/files/1/0429/6605/7116/files/hindi_item_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/72688475790.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/linear_equation_in_two_variables_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/5005/5318/files/connected_components_workbench_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/denijepakewonepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/zokevixuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/suniduwosudorokimixurakoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d44.bin
dc3c5c7e3968fb8d1db6e0f6e0484e8e6e7c7bf7e375c63e0e9f2f3f4d7eca2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D44 4976 bytes
font_01_sfnt_off00006e26.bin
18c327ed8721935f875a85d5cf7ee948be100d694a0e4a8b7d530c7c641f1378
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E26 10048 bytes
font_02_sfnt_off0000907a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x907A 4324 bytes