Malicious PDF — malware analysis report

Static analysis result for SHA-256 138f1be43fbb6acd…

MALICIOUS

PDF

45.4 KB Created: 2020-08-13 04:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8111b98f86595545c7c81ac1a70c2300 SHA-1: fb76779b4e3ee2d3b3a6d121e4f43a0b80759313 SHA-256: 138f1be43fbb6acd8775da96d7ae96f90d3067878b7045c2074d34ebb678b08d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to study materials, aiming to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL points towards a phishing or malware distribution attempt.

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=benim+hocam+yks+tarih+ders+notlar%25C4%25B1+pdf
    • http://files.greenmountaingrills.co.uk/uploads/1/3/2/6/132695543/xosilumedaxu.pdf
    • http://vodix.ritasimonwedding.com/uploads/1/3/0/7/130739240/778d1f62efda4b.pdf
    • http://files.pennyanambulance.org/uploads/1/3/0/7/130774990/df9da.pdf
    • http://files.kaycorcoran.com/uploads/1/3/0/7/130775145/cf4abaacb3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/43826521474.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6471/files/limpieza_de_sangre_libro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/my_way_piano_sheet_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/zezadugowekedalajixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/fepovazejume.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/archlinux_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/9228/5342/files/85242822808.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/third_grade_spelling_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/navy_seal_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0869/files/sezimamafisesoragojof.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/data_structures_and_algorithms_using_python_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/99957528079.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/88129799729.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/91299277254.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_off00006dc9.bin
a0cc4a9844f98105ac420b495da4ee1b6b35b5c4860a65d3c5df0847ab1d9ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC9 5640 bytes
font_01_sfnt_off000080cd.bin
04ba124d12be2cc5a6c01d1c499fec3cf069c874843d61939986226e98f54798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80CD 11908 bytes

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