Malicious PDF — malware analysis report

Static analysis result for SHA-256 418e2c58802c0d55…

MALICIOUS

PDF

72.9 KB Created: 2020-08-16 21:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c737d976b3142e46a0b8580f926f5fb3 SHA-1: d412a113afc7cf600c55f63585a03c7c8c426152 SHA-256: 418e2c58802c0d5538b45d54b8b1dcaebb2d384c524880be51c19dd3d2ded0b1
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a malicious site. No scripts were extracted, limiting further analysis of the delivery mechanism.

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=ated+online+form
    • http://dejidipu.thelondongrillclub.co.uk/uploads/1/3/2/6/132682883/f3758.pdf
    • http://files.rambosiu.com/uploads/1/3/0/8/130873728/2948675.pdf
    • http://files.tntgreatfalls.com/uploads/1/3/0/7/130775653/jenezudaxaro-waxikebibupo-gosolukisiweziw-fefuwajadijo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/21329158761.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/16406076096.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/venkatrama_telugu_calendar_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/mivagavibafajuxaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0454/files/1290585889.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/1695590025.pdf
    • https://cdn.shopify.com/s/files/1/0441/4413/2248/files/36685469586.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_off0000d671.bin
c7450c4f8db3ce48fc20fc633515ad9e945889d70aabd4ded057329ee29e5e66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 4440 bytes
font_01_sfnt_off0000e55d.bin
58bad98079242e99876651cbdc05bbf5b9e2554d3b4e0ca14f5169f090635785		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 10468 bytes
font_02_sfnt_off00010915.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 4324 bytes

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