Malicious PDF — malware analysis report

Static analysis result for SHA-256 251c4a71c168da7e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-10 04:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3afb1fb4cb05094737f55dcfc211d894 SHA-1: bf3e6f8b00de207e8040b3fbcfb5e7bb032988db SHA-256: 251c4a71c168da7e5b30ad07d40983456fc4f24aa319d65c5f871d743b754ef6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDF files, many of which are hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. The primary redirector URL, https://ttraff.com/pify?keyword=gate+mathematics+notes+pdf+download, is flagged as malicious and indicative of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=gate+mathematics+notes+pdf+download In PDF document text
    • http://files.tn932.org/uploads/1/3/0/7/130739718/xotijugof-fisofozis.pdfIn PDF document text
    • http://files.harrillconstructioninc.com/uploads/1/3/0/9/130969300/davitozumasoxum.pdfIn PDF document text
    • http://files.bellafurworks.com/uploads/1/3/0/8/130874204/pewex.pdfIn PDF document text
    • http://files.redeemerfortbend.org/uploads/1/3/1/3/131380031/d9f46fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/fawozepuxalefurarosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4503/files/93415836093.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/barbiturate_coma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/newilikegireto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/95761131567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/17179471219.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/siwadesafix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9902/9655/files/tilimagubokunewufovudusum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9124/4696/files/air_pollution_and_control_technologies_by_anjaneyulu_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/chemical_properties_of_alkaline_earth_metals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/janojupakovumibisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/42303662792.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59E3 5424 bytes
SHA-256: ed4965e713e668469ef95eaa2325abcb57bc0827732c74bf596c9143d5a2208e
font_01_sfnt_off00006c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C43 2116 bytes
SHA-256: 2d35fe1b112251630f6c3e185fb4bf58c6327cea99f60afab3ca0473214b5b30
font_02_sfnt_off0000760f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760F 10596 bytes
SHA-256: 14bd68f0a082b740c38aa2822829c0d663931fc621e7bb5d5fc092ace2767aab

Open this report in the interactive analyzer, or submit your own file for analysis.