Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ba11b7e55aa056…

MALICIOUS

PDF

41.8 KB Created: 2020-08-04 03:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c848a89f485fb2148c0268d5b44eda00 SHA-1: 6d72aba163bf82e315e37a458aa2820547bbb161 SHA-256: 34ba11b7e55aa0565e9996b4faa3cbc8fdb412249fc09f1121af6d4cdbea59c7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=possessivpronomen+%25C3%25BCbungen+a1+pdf. The document body appears to be obfuscated or corrupted, but the presence of many links, including to a redirector, strongly suggests a phishing or malicious redirection attempt. The ML classifier also flagged this PDF with high confidence.

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=possessivpronomen+%25C3%25BCbungen+a1+pdf
    • http://files.bearbugmedia.com/uploads/1/3/0/9/130969204/30b2558e.pdf
    • http://files.tourdetech.net/uploads/1/3/1/4/131437523/wurarijala.pdf
    • http://files.publicsportsbook.com/uploads/1/3/1/8/131857983/pezadupuzemut.pdf
    • http://files.mrsyoshida.com/uploads/1/3/0/7/130775320/nodokerab_vofusotulatutiv_xuvufesimuse.pdf
    • http://files.nickysawesomewebsite.com/uploads/1/3/1/6/131636692/1974110.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/38454799796.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/butezedudoxadim.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/first_letter_of_each_word.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/13787613134.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/wivoxepog.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1966/files/mekitagojufujuxafim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/important_current_affairs_of_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/16584902759.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/14841397394.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/10903029985.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4693/files/ayurveda_quiz.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_off000052ee.bin
38c24d62060c45b3a71031f6df8662a6b390497a4a6e6063a8063aa0088cf050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52EE 5504 bytes
font_01_sfnt_off0000655b.bin
9354fe7c055a6b7613de7c6a52b9c89f88f193cd47341a68a445e6db5f3c9c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655B 11200 bytes
font_02_sfnt_off00008a40.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A40 4324 bytes

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