Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1860923ff8b4838…

MALICIOUS

PDF

40.4 KB Created: 2020-08-17 15:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5b99e29d19dea97e45b719f760ce4bf SHA-1: 2bdd83b3591514d1970cca9cca1f542ff6dc0309 SHA-256: f1860923ff8b4838269b12e1493f3000419fa4f9736fb69e8b343afba8c7d0cc
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same redirector URL and a keyword suggesting a lure. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=android+podcast+app+auto
    • http://bufom.neattucks.com/uploads/1/3/0/8/130874493/deponijomirut.pdf
    • http://files.skiowsa.com/uploads/1/3/2/6/132681296/worexepuki.pdf
    • http://files.binauralbeatsmaster.com/uploads/1/3/0/7/130775786/8857350.pdf
    • https://cdn.shopify.com/s/files/1/0440/1951/5557/files/sonaxibotefilidonuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9507/2673/files/maberinimugajififepuka.pdf
    • https://cdn.shopify.com/s/files/1/0435/7118/3777/files/wheat_berries_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/gifuravesamibapafadige.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/zasol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/32300904848.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/kunofetu.pdf
    • https://cdn.shopify.com/s/files/1/0451/7933/8903/files/78457851068.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/redaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/wuraliwedujaserugo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/fowuwodefodukaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/walt_disney_world_transportation_map.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_off00006154.bin
122c7551599445271ffdfc00c125d5e71c2106ec9162384fabc3e2bfe6ff17d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6154 5024 bytes
font_01_sfnt_off00007269.bin
95c8d11dca65475746b88c01832c4db912050eecad44488b55df5542accb1865
pdf-font-stream PDF embedded font (sfnt) at offset 0x7269 10064 bytes