Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00b1889b6df77a3…

MALICIOUS

PDF

47.3 KB Created: 2020-11-09 10:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a84a276603700771c0d6bdb566406b2e SHA-1: 589389a637ae772444ea6634155596fa0f5ae394 SHA-256: f00b1889b6df77a33842eeb9623e0d5792025db6f144ab02ccafa3a93d57ba7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically directing users to 'traffmen.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation. The ML classifier strongly indicates maliciousness, and the embedded URLs suggest an attempt to drive traffic to potentially harmful sites.

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://traffmen.ru/123?keyword=escape+prison+game+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://firijidu.files.wordpress.com/2020/11/pezexa.pdf
    • https://s3.amazonaws.com/bojafazes/juxagavotedijewaberof.pdf
    • https://s3.amazonaws.com/fokapikow/labikipidoluk.pdf
    • https://uploads.strikinglycdn.com/files/40b10a5f-955f-43d6-b9d1-d103495516ca/invert_colors.pdf
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.pdf
    • https://s3.amazonaws.com/venunamazozuzo/4265270316.pdf
    • https://mebemesu.files.wordpress.com/2020/11/integrated_pest_management_notes.pdf
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdf
    • https://s3.amazonaws.com/fukezavazuj/bafakumedaramolaju.pdf
    • https://s3.amazonaws.com/limepusotanal/pictures_of_prehistoric_sea_creatures.pdf
    • https://s3.amazonaws.com/xanebavifamopez/15486035404.pdf
    • https://s3.amazonaws.com/teximikamukubo/pilumugovufidowugutiru.pdf
    • https://zopovamodutu.files.wordpress.com/2020/11/45329342212.pdf
    • https://s3.amazonaws.com/luborinizu/kawaguzizeluzetadoti.pdf
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdf
    • https://uploads.strikinglycdn.com/files/ae6207ae-f385-4c12-8ff7-f7889ea2d75b/weather_in_turtle_creek_pa_fahrenheit.pdf
    • https://xekegaxasal.files.wordpress.com/2020/11/11823565085.pdf
    • https://s3.amazonaws.com/mukutud/howard_university_for_international_students.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a19.bin
1be50e6865f867ad784b90c03715bffffa476f9e4680c7504ae19ebf6a7cf9be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A19 5212 bytes
font_01_sfnt_off00008bc4.bin
758aa88426678633995b41342ab5e3d857fa13f7c584e514f1b9ca80cd61a097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC4 10888 bytes

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