Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0a49c054accddf…

MALICIOUS

PDF

54.5 KB Created: 2020-08-05 05:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4276a54dcfa7cd6fcf16771567b18cd2 SHA-1: 8c88215ec8b0f6a34c64e8632c9b0d2305e65e5a SHA-256: 6a0a49c054accddf1b3198775e3420707e6bff50a3575012353e199011c6c98e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. This suggests the primary purpose is to redirect users to malicious content, 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.com/pify?keyword=bright+line+eating+pdf
    • http://files.leonkew.com/uploads/1/3/1/4/131408546/xofofub_wemopamalozuwa_pubofozutege_dajajepiv.pdf
    • http://files.trducks.com/uploads/1/3/1/8/131871643/jefixesupud.pdf
    • http://files.flatspokecycles.com/uploads/1/3/1/4/131408529/6549756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4633/8709/files/volugasusikifozawaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/vedaxixepakomumigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/77071209978.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/serway_faughn_college_physics_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/apprendre_langue_allemande.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/sikofim.pdf
    • https://cdn.shopify.com/s/files/1/0433/4089/0262/files/tojamafiwubakawelamujom.pdf
    • https://cdn.shopify.com/s/files/1/0432/6614/6472/files/tusolozazimodewixip.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/furodusekuwexipudawixar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8864/9123/files/badodedonivumonavesepugo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/66971483930.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/39021642194.pdf
    • https://cdn.shopify.com/s/files/1/0433/5062/2358/files/engineering_drawing_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/7012752132.pdf
    • https://cdn.shopify.com/s/files/1/0449/0834/7547/files/english_grammar_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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ea7.bin
52f46407acad4bcbe4d824f2c7e58ab6b8f6a7ab0bfc30a28334163648c6b9b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA7 5176 bytes
font_01_sfnt_off0000a03b.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03B 1800 bytes
font_02_sfnt_off0000a8c9.bin
a81fc6ec013a0238a1218161d25e3825bed362282cff45f4d34b17d74c6b040d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C9 10388 bytes

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