Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7b87dcfd5414e1…

MALICIOUS

PDF

43.9 KB Created: 2020-08-12 16:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f988e69a1a5ce3954b67fd72dbc93b3 SHA-1: 6d77dcc7f6ee5721da85b98cb382319462ca9085 SHA-256: 8a7b87dcfd5414e11424931997b33411e8b040ca39943b7e351c1a8cca1998b9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a link farm and a critical redirector link pointing to ttraff.cc, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the same URL as the redirector link, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/wb?keyword=predicting%20products%20of%20synthesis%20and%20decomposition%20reactions%20worksheet
    • http://files.littlevandesignstudio.com/uploads/1/3/0/7/130740367/vajibugeme_fusasasajag.pdf
    • http://rakuwuw.dmcihomesonline.com/uploads/1/3/1/8/131855981/kigezudupor-nalunegopujofij-temopulose.pdf
    • http://files.dixielandbandorlando.com/uploads/1/3/0/9/130970012/garosejomagit-dovuduwibaf-jomevow.pdf
    • http://files.latashahowell.com/uploads/1/3/1/0/131070246/kurulixe-safusuxewopubo.pdf
    • http://files.theredbarnpizza.com/uploads/1/3/0/9/130969057/7144c9e.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/44826556022.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/53598893893.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/63006948747.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/le_verbe_etre_et_avoir_a_tous_les_temps.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33971068516.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/accp_guidelines_vte.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/71946172710.pdf
    • https://cdn.shopify.com/s/files/1/0436/1325/7885/files/32737212343.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/d_d_elder_evils.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/11521190305.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.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/
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/11521190305.pd

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d81.bin
37356c698bd93241058eefa1d24d87e75ea468702480e8bca6fb86ccc64939bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D81 5680 bytes
font_01_sfnt_off000070b3.bin
2fdf50aaad7effa37d6028b325116d6acab4b7ab65293c06e52489f4636b6aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 10272 bytes
font_02_sfnt_off000093e0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93E0 4324 bytes

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