Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffb33f1bc87049c…

MALICIOUS

PDF

61.7 KB Created: 2020-08-17 18:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc86bb358d0e2e44fb83dcb9b27f59f3 SHA-1: c8301efaf34aa9c029f6c5a856652652a609aee4 SHA-256: cffb33f1bc87049cc7b9089e84793a8195099995ad2683f795e78cb008e61bd3
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Barkatullah university application form 2018' and a URL pointing to a redirector. This suggests a phishing or scam attempt to lure users to malicious infrastructure.

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=barkatullah+university+application+form+2018
    • http://boberu.zenbeautyspa.com.au/uploads/1/3/1/4/131483281/571945167323.pdf
    • http://files.hensontractorinc.com/uploads/1/3/1/0/131071167/savumiful.pdf
    • http://newujika.lifestyleofthebeliever.org/uploads/1/3/1/4/131410685/vokukozuvod.pdf
    • http://gotixuwe.prestigesupport.org/uploads/1/3/0/7/130775219/zovew.pdf
    • http://files.thepitchthemovie.com/uploads/1/3/0/7/130775918/107df9a6.pdf
    • https://cdn.shopify.com/s/files/1/0430/9978/3319/files/knee_arthrocentesis_procedure_note_template.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/avani_avittam_mantras_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3230/5054/files/basic_electronics_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2525/0974/files/logejuxikefokamal.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/deduwisawavetedozalivavad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1346/files/49138948935.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/lolirokudurirepukumodu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4124/files/exercise_past_simple_present_perfect.pdf
    • https://cdn.shopify.com/s/files/1/0434/1900/9189/files/odoo_technical_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/dirafubavaririvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/komovesubagotafijuviviz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0468/9558/files/75268493768.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/anttepe_yaynclk_5_snf_trke_ders_kitab.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_off00009039.bin
a7552a3c598e27968ef250c77f92087e04c102676811ccebc96e4a770b346f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9039 6052 bytes
font_01_sfnt_off0000a4b7.bin
1a226a4aeb71e24b3ff01ac03360b56fac1fe21e11da8bdce9c685c2cec67ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B7 14896 bytes
font_02_sfnt_off0000d3a3.bin
4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 16164 bytes

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