Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dd8a7ed9cd3396…

MALICIOUS

PDF

56.1 KB Created: 2020-08-07 09:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45e95a3a53525b5161112926100936a4 SHA-1: 88452430a93a60663543334544538a68aa52fb80 SHA-256: 18dd8a7ed9cd33966d2c992af8af497d9eeda22823e1830fe6e8a9572754c751
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to external PDF files, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of URLs and the link farm heuristic suggest an attempt to lure users to malicious 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=laporan+titrasi+kompleksometri+pdf
    • http://files.trebellepianotrio.org/uploads/1/3/2/8/132814050/5697667.pdf
    • http://roxageled.missionmuffins.org/uploads/1/3/1/0/131070872/3976574.pdf
    • http://files.daksart.com/uploads/1/3/1/3/131381640/5356882.pdf
    • http://files.agentsreferralnetwork.com/uploads/1/3/0/7/130738564/1954539.pdf
    • http://tepot.dns-for-me.org/uploads/1/3/1/4/131437987/lafivesawetor-wofodox-pexawajifujoxoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/pong_game_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9132/files/primavera_p6_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/65414092392.pdf
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/rogue_lineage_silver_sun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/fumujajokagokiviganawuna.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/bhagavad_gita_livro.pdf
    • https://cdn.shopify.com/s/files/1/0433/5730/7039/files/nuclear_throne_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0434/5158/0568/files/22939011985.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3616/files/51256345888.pdf
    • https://cdn.shopify.com/s/files/1/0435/3789/1477/files/89842246131.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_off00009f15.bin
7f861eee024d4e4430d4f5ef3418ec0d32443af1eaa8cf01cc64d9d89c966d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F15 5192 bytes
font_01_sfnt_off0000b0af.bin
e5718929df09aab725593850dbb8db8bd0a7ae0d494c0b4c05d575fa13d95007		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AF 10144 bytes

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