Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7cb61e9615d81b…

MALICIOUS

PDF

44.2 KB Created: 2020-08-23 20:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9550184466babae752c58ae0488174 SHA-1: 66fe7950317d101e1bf48778a4403c96414b8359 SHA-256: 3e7cb61e9615d81bb34f86b712218374698853e35ad5ed3a9fad144643a46d9b
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with the primary malicious redirector being ttraff.ru. The document body, though heavily obfuscated, contains the text 'My shed plans free' and the malicious URL, suggesting a lure to trick users into clicking on the links. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports the malicious intent.

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=my+shed+plans+free
    • http://files.versus.band/uploads/1/3/0/7/130738779/sasuweti-pawofi-jowuseliluvif.pdf
    • http://roxivol.joshuacolecampbellstore.com/uploads/1/3/1/0/131070357/lukulakibisi.pdf
    • http://files.wallabymommy.com/uploads/1/3/2/7/132740836/051438.pdf
    • https://cdn.shopify.com/s/files/1/0449/1676/8923/files/how_to_advertise_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0437/6965/9549/files/ifsw_statement_of_ethical_principles.pdf
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/63145912408.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/personification_in_poetry.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5121/files/67177955383.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/bhagavad_gita_slokas.pdf
    • https://cdn.shopify.com/s/files/1/0437/7998/1470/files/expedition_unknown_episode_guide_tvdb.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/kokodasifem.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/63983335946.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/47362843421.pdf
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/2383905300.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/make_gif_from_youtube.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_off00006eb8.bin
e62c0193a7fca9fd18071057c623607f9eb2097a587726f47fa10fd30a3364da
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB8 5236 bytes
font_01_sfnt_off0000808f.bin
20be4eca958152ff558b7faa62ad092a36ffe6bcb43854d912d33ad8e441e60e
pdf-font-stream PDF embedded font (sfnt) at offset 0x808F 10328 bytes