Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b42ba0627116570…

MALICIOUS

PDF

45.9 KB Created: 2020-08-19 18:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee782136d3a3f7d3bc7157f490777fe8 SHA-1: 5edddba5da60012422e64eb1b29dae98191f6322 SHA-256: 4b42ba062711657022a604345508b804ae0c148b00f08dfae2b2794e0aa601f1
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a redirector. The primary redirector URL is https://ttraff.ru/pify?keyword=beautiful+now++song. This suggests the document is designed to lead users to malicious content through a chain of redirects, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and link farm are strong indicators of malicious intent.

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=beautiful+now++song
    • http://miwajutu.kylehughesaudio.com/uploads/1/3/2/3/132303124/xikemi_limuvaf_givememewewe_vuzijimedi.pdf
    • http://files.ellenjohnsonmosley.com/uploads/1/3/2/6/132695517/887644f1.pdf
    • https://cdn.shopify.com/s/files/1/0438/1445/3410/files/74020515897.pdf
    • https://cdn.shopify.com/s/files/1/0435/3386/1018/files/whatsapp_plus_ios_11.pdf
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/volume_of_a_cuboid_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/matolijokis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/78307163414.pdf
    • https://cdn.shopify.com/s/files/1/0431/5221/2130/files/odisha_b._ed_course_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/bufotof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1765/files/fagafegupovimuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1158/files/computational_bayesian_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/feviwupog.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/favovipaxikasakifibimavi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/37140738743.pdf
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/mekibig.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_off000063ea.bin
f5593e7e295159f8ff75c2bb74fbbc8f0182dac915eb117ac30bb1d8a68887bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA 4860 bytes
font_01_sfnt_off000074a2.bin
999b5d49ef1c39c2478294997d7dedc41e35942d5dc90f085c558af45af156b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A2 12668 bytes
font_02_sfnt_off00009d20.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D20 4324 bytes

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