Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ad282b9ded4d3c…

MALICIOUS

PDF

46.0 KB Created: 2020-08-09 22:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e95165e5bdf3b64b07b6821afaf3f911 SHA-1: 366186f6627c62c8ddf4185d8eb04d48812e7059 SHA-256: 23ad282b9ded4d3c7be77a98a4362e3a2abb5bea236f1b284d837524cda2cd3c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and references 'business english teaching materials pdf', suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user 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/pify?keyword=business+english+teaching+materials+pdf
    • http://ludugel.ecosystemarts.org/uploads/1/3/0/7/130775934/650b60.pdf
    • http://files.soldotnaequestrianassociation.com/uploads/1/3/2/8/132815220/4945664.pdf
    • http://files.electricrailwayclubsflorida.com/uploads/1/3/0/7/130739836/lozumijapujet-mejimisi-muwiboli-mogiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0432/1234/1416/files/16270065589.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/47988554263.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/63674525664.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/logitech_extreme_3d_pro_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/40885764325.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/46368102566.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/89648853515.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/9157784511.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/74875542097.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/17180526648.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/14787472186.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/sololuri.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_off0000683d.bin
00fdc6a23bc511275cc960a3b1991287900edc22c20e477a6a5d44b24de57283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683D 5388 bytes
font_01_sfnt_off00007a58.bin
9448e80d650fb83bf6eb45197945ef28751770ad81b9d8dba90379411f560391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A58 10092 bytes
font_02_sfnt_off00009cd1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD1 4324 bytes

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