Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a6d7003eedf425…

MALICIOUS

PDF

40.4 KB Created: 2020-08-12 06:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f7d7512bf22d7f3382d4cd319e9240 SHA-1: d23cb0324dcc59e0f5b430b9614fba9cef725318 SHA-256: b6a6d7003eedf4253bcb28648f94192901e7985b2e081bbf29f5f99a609893ea
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or redirection strategy. One prominent link, 'https://ttraff.com/wb?keyword=renaming%20maths%20worksheets', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this URL and other Shopify links, likely intended to deceive the user into clicking through to malicious infrastructure.

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.com/wb?keyword=renaming%20maths%20worksheets
    • http://forobo.themkdesign.com/uploads/1/3/0/9/130969472/3351859.pdf
    • http://watin.bkdarlinggeochem.com/uploads/1/3/0/9/130969204/nokasajawomitamilisa.pdf
    • http://files.castlegarpeony.com/uploads/1/3/1/8/131871740/3403902.pdf
    • http://vosurij.tpstraining.com.au/uploads/1/3/2/6/132682883/2227501.pdf
    • http://files.shopboutiqueboutique.com/uploads/1/3/0/7/130776401/2cf6f147afff4b.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/acer_al2216_w.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/ruponido.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/vepamemevisu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wonazonuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6533/4165/files/cavum_douglas_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/lowakuliserorizute.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/90420337299.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/54882405857.pdf
    • https://cdn.shopify.com/s/files/1/0448/3982/9661/files/interior_design_for_small_house.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/8472679102.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/ucsd_applicant_portal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/15835315797.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_off00006126.bin
b3dca3f575b0721013fcdd8cc57d01a865a97808ee2f3a066be65af5303f11ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 5232 bytes
font_01_sfnt_off000072db.bin
1e267d619dd3c91c00a2304fb66531a8a6bbd6644c67306c5f31e60f33eff407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DB 10008 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.