Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f1de9b0de26fa4…

MALICIOUS

PDF

52.4 KB Created: 2020-08-06 15:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8255669942c248ced9d9e993b8478ad SHA-1: 3c41d388ce0f3f74e6c7f5f488e27c6af1b68e03 SHA-256: 55f1de9b0de26fa49859999a770102d6ac1bd7c5bffa5063a7ada27b51aa6ca3
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many hosted on Shopify, designed to appear as legitimate search results for 'Bihar iti counselling date 2020 pdf'. One of these links, https://ttraff.com/pify?keyword=bihar+iti+counselling+date+2020+pdf, points to a known malicious redirector. This indicates a likely phishing or content-scraping campaign aiming to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=bihar+iti+counselling+date+2020+pdf
    • http://files.swe-rms.org/uploads/1/3/2/8/132816165/sovatipupi.pdf
    • http://files.murilloguitar.com/uploads/1/3/2/3/132302924/832755.pdf
    • http://files.moniamotorcycles.co.uk/uploads/1/3/2/8/132814415/1559869.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/54250155968.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/zofukejoluloruvul.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/47750354794.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/58314726195.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4583/files/80958912924.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/47959759865.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/soxavopiger.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/ruvufulivelugidegizi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1145/5645/files/ridawudigefifilum.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5395/files/oxford_advanced_learner_s_dictionary_9th_edition_international_student_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/xofowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3411/5233/files/zaverugisavonuniwimijun.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/27925473959.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f22.bin
4478665c7341372001ffc8908c71e362faaabab5625478dfda2d1ae922704cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F22 5740 bytes
font_01_sfnt_off000072a2.bin
d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A2 2320 bytes
font_02_sfnt_off00007cf3.bin
5883fa73ce37f0e79b84343b552c93112bce3b488940e7a64e264abad34bcb7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF3 9736 bytes
font_03_sfnt_off00009e85.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E85 16224 bytes
font_04_sfnt_off0000b40d.bin
cc9d77aabb5244601921515a0ee015a87e797279b15182ad6388f11b0c3dd7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB40D 4072 bytes

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