Malicious PDF — malware analysis report

Static analysis result for SHA-256 0102fe90eac6df60…

MALICIOUS

PDF

44.0 KB Created: 2020-08-04 08:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2125df71bf96a94d6547f25d25ee3ef SHA-1: 70ea6d4920c7b3cd2def8f6edf1ea950df68d502 SHA-256: 0102fe90eac6df60e79ccbfca04c68553a8236cabee65aeaa6e06915924a480a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=kpss+vatanda%25C5%259Fl%25C4%25B1k+ders+notlar%25C4%25B1+pdf+2020+benim+hocam'. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to 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://ttraff.ru/pify?keyword=kpss+vatanda%25C5%259Fl%25C4%25B1k+ders+notlar%25C4%25B1+pdf+2020+benim+hocam
    • http://files.chiroability.com/uploads/1/3/0/9/130969052/vilurukerexa-jixazibapi-mivubakuman.pdf
    • http://files.kicksvilleshop.com/uploads/1/3/0/7/130776336/6129068.pdf
    • http://files.penguinempirerobotics.org/uploads/1/3/1/4/131437149/borobume.pdf
    • http://bupavo.mikehateseverything.net/uploads/1/3/0/8/130874633/bapone-rovopemok-banamazoxivuxaj.pdf
    • http://files.marissaaltmann.com/uploads/1/3/0/7/130775156/fijuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/how_to_bold_letters_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/tom_and_jerry_matrix_game.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/20795286639.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/50662581381.pdf
    • https://cdn.shopify.com/s/files/1/0433/2011/5358/files/vuvusazuluvumin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8260/files/zutirodos.pdf
    • https://cdn.shopify.com/s/files/1/0447/3192/4629/files/rapid_city_sd_craigslist.pdf
    • https://cdn.shopify.com/s/files/1/0438/2529/9606/files/77928517186.pdf
    • https://cdn.shopify.com/s/files/1/0437/5268/5717/files/german_a1_vocabulary_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/grow_rpg_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/kabepidekupamimur.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005138.bin
f250179ce49c442c36383a286fcf788186dd1426e92c9ba3199cecee38829a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5138 6180 bytes
font_01_sfnt_off0000659b.bin
dbe1e4bf2c9fdb83f8344cbe1ea0b5200f7933670ccd84d406fbb2c1c9b814d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 11732 bytes
font_02_sfnt_off00008a56.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A56 16312 bytes

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