Malicious PDF — malware analysis report

Static analysis result for SHA-256 828f3f68a976ce40…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 02:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1324d82a13b5c3ed3671a3126032c32 SHA-1: 0abda1e60ab7dd4537b233b63b37c633e2dbcafd SHA-256: 828f3f68a976ce4002958c3947acbbec32b29bc06fef0677b02886496f880dfb
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service. The primary link, 'https://ttraff.cc/pify?keyword=ielts+academic+reading+test+samples+with+answers', is designed to trick users into believing they are accessing academic materials, but it ultimately leads to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=ielts+academic+reading+test+samples+with+answers
    • http://files.caasfepconference2020.org/uploads/1/3/1/4/131454316/3755089.pdf
    • http://files.laurenrodolakis.com/uploads/1/3/1/8/131856703/nozitaroberawen_lanonerabufag_fulopukizizuru.pdf
    • http://files.tntdeesign.com/uploads/1/3/0/7/130776503/jawipuk-bonusotiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/demisanakolaxowefutanas.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/levodoxukanijeto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotalufakelani.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/zonigese.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/nezik.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/barron_s_act_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/97674918562.pdf
    • https://cdn.shopify.com/s/files/1/0430/0826/2297/files/shimano_deore_lx_schaltung_einstellen_anleitung.pdf
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/41199931664.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/nasugikado.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/27117656042.pdf
    • https://cdn.shopify.com/s/files/1/0440/2357/8774/files/98720578594.pdf
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/mugadobunaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/61129967127.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_off000058fd.bin
99eb4b7616ebd4569958dcb6f3ee6a21538958c6dbff480ed250a213b36a161d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FD 5516 bytes
font_01_sfnt_off00006b98.bin
6d9a26231161ff38acb2482a589f59ad6d265f5996578ba4511ec5c888b133b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B98 14560 bytes

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