Malicious PDF — malware analysis report

Static analysis result for SHA-256 83329a12af2dd9c5…

MALICIOUS

PDF

40.3 KB Created: 2020-08-09 22:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3d5f3bdaf272cffd73907a39456ab1 SHA-1: 4d4bae07a84088d43b69c91b6220b7f4ae6a5750 SHA-256: 83329a12af2dd9c5b66d6ffe1c0f157b3ac87d2ce8916baec4c4b7da52c9f8b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm designed to manipulate search engine results. This suggests the primary goal is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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=free+download+pdf+dictionary+english+to+bengali
    • http://files.pda4training.com/uploads/1/3/1/4/131438538/pezibixoxewopup-lisolar-firubef-jejubano.pdf
    • http://ratoxe.arambulolive.com/uploads/1/3/2/6/132681513/bubuwimomu-robubuzewedoxed.pdf
    • http://files.aprilfairbrother.com/uploads/1/3/1/4/131437889/6de74cdccab2ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57189589950.pdf
    • https://cdn.shopify.com/s/files/1/0446/2054/6211/files/55381308808.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/12525184785.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/dametujiwifutaxajevudiwo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/synchronous_and_asynchronous_communication.pdf
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/surig.pdf
    • https://cdn.shopify.com/s/files/1/0438/9063/9016/files/tyler_perrys_whats_done_in_the_dark.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/cardiac_muscle_contraction.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/munuperilivifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/network_marketing_strategies.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050fc.bin
22780453fc16ffc3aa5231a31f424fd24792307e966232c17100d5efd18846e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50FC 5492 bytes
font_01_sfnt_off000063b6.bin
21a6ac52fe62729d036a96e08989aec8d70df89ad8809eab0a753658fe3ce242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B6 10128 bytes
font_02_sfnt_off00008663.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8663 4324 bytes

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