Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79af3a035b607ed…

MALICIOUS

PDF

45.7 KB Created: 2020-08-15 10:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e34a536ff8451e4c796a0df212342d65 SHA-1: 78dcf42dc1e0f953d4663ca0ef7ee30e8a004afb SHA-256: a79af3a035b607eda722c0e55538c7f1504fe0e5ac117b0d47fb905336cdb29d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text referencing a manual and includes the primary malicious URL. The ML classifier strongly supports the malicious verdict. The embedded links likely serve to redirect users to malicious sites 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.ru/wb?keyword=wittmann%20tempro%20basic%20manual
    • http://xaxosoga.myardysslife.com/uploads/1/3/1/4/131410685/bukev.pdf
    • http://files.co-oplink.net/uploads/1/3/1/8/131856636/petixebopegumurafum.pdf
    • http://files.foldedfeather.com/uploads/1/3/0/7/130738720/kafema.pdf
    • http://files.westabytreeservice.com/uploads/1/3/1/4/131407148/zirav-sojotukaxuze.pdf
    • http://files.princetonclubsummercamp.com/uploads/1/3/1/3/131379540/3657729.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/dukefij.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6145/files/rak_vitrified_tiles_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/monthly_attendance_sheet_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/fefisaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/modern_biology_study_guide_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/7637/6983/files/honda_pioneer_500_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1822/2753/files/jurnal_invertebrata_laut.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/68930856160.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/zejenixurusowoseneseraxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/above_top_secret_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/85080056414.pdf
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/rumavulajogapenibudexuwew.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/calculus_third_edition_rogawski.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8136/files/ziwemusarixanilixeseli.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/singer_heavy_duty_4423_repair_manual.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_off00005f20.bin
d692479b2611f32c7456e62b79902035381ba63eeb26d344b089e1945a407498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 5232 bytes
font_01_sfnt_off000070ca.bin
441169940f3aa78f35f405df943b85698055d012d2518edfe23536064b299d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CA 10252 bytes
font_02_sfnt_off0000940d.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x940D 16092 bytes

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