Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c96be402919bcd3…

MALICIOUS

PDF

50.9 KB Created: 2020-09-01 05:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8cf723e6130c8fb7c64584c2f5d5b0e SHA-1: 1509500b882cf921b6f4da8d811ae8e9328c05d9 SHA-256: 4c96be402919bcd34353851cb86149c3fd226262251383b0a61d332ad63af426
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary malicious URL being ttraff.com. While the document body contains text related to 'Bishops stortford college pre prep uniform', this appears to be a lure, as the primary malicious activity is the redirection to the ttraff.com URL.

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=bishops+stortford+college+pre+prep+uniform
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/english_business_letters_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/pufilodugejeri.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/29896216582.pdf
    • https://cdn.shopify.com/s/files/1/0428/1847/0044/files/bulandi_movie_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3907/files/gamiderazogorefapato.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/52024164143.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/esophageal_atresia.pdf
    • https://cdn.shopify.com/s/files/1/0444/3032/7975/files/acrobat_reader_free_download_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/5926/5188/files/pajedefakawakemevoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6001/0912/files/foraxajelelirakotulelid.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/clavier_arabe_azerty.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3564/files/sagapolakajij.pdf
    • https://cdn.shopify.com/s/files/1/0459/8824/9757/files/clothes_washing_symbols_guide.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_off0000798a.bin
641678e51a835ef32b5fc0a014b713383f9bd41f874e531d99243334978bf95b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798A 5408 bytes
font_01_sfnt_off00008bc7.bin
58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC7 6068 bytes
font_02_sfnt_off00009b78.bin
0e50979c7c01f9b5bbbd5a627e49554dc6f7f7bd23b530e0194082197eb8c854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B78 10208 bytes

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