Malicious PDF — malware analysis report

Static analysis result for SHA-256 6271fdfce5816270…

MALICIOUS

PDF

60.3 KB Created: 2020-08-14 10:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99d626e0d25ac74d0ed0942b3e3cbef2 SHA-1: 0bcbd28fcc0d73628ec237227169c63b9307dc48 SHA-256: 6271fdfce5816270cd014b9a70b21a0046fe7c090af0b0925d2f30901836c286
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to host further malicious content or phishing pages. The document body, though heavily obfuscated, contains the same URL and numerous other PDF links, suggesting a link farm designed to obscure the true malicious destination. The ML classifier also strongly indicated maliciousness.

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=browser+apk+vpn
    • http://files.enviroaesthetic.com/uploads/1/3/2/6/132682745/kinogozajuvija_raxubeni_nunakijaku_jogexesuzawon.pdf
    • http://files.klikdesigns.com/uploads/1/3/1/4/131409305/xibujubinivibisa.pdf
    • http://files.americanfoursquare.us/uploads/1/3/2/7/132740218/majibomavapakabopi.pdf
    • http://files.detailersdirect.co.uk/uploads/1/3/2/8/132815785/dinaxotegosokelumabu.pdf
    • http://files.robertrichoux.com/uploads/1/3/0/9/130969825/jivufogekeduzalev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/64161118917.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/vowidawatuwigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/gigovikebipebuxoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/3918/6344/files/amplificateur_operationnel_en_regime_lineaire.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3303/files/exploding_kitten_cards.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/runisorematizovo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0167/files/alesis_sr-_16_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/dagirovene.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/lexus_is300_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0434/3676/9447/files/elves_bowling_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/1641/3607/files/25560942407.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/ritobokuraxifexumenajubej.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7624/files/dowemomovewipofabun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/bending_machine_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081eb.bin
96baba92b9f83faa7fe3b164e29af204896fd6481fd330bb53063a337ac50f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EB 5044 bytes
font_01_sfnt_off00009339.bin
d4090e7d68e414416d4d55397ea5349ce23ae8e7553dd139544b8c8eecc01a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9339 6740 bytes
font_02_sfnt_off0000a9d3.bin
88617609f02e2f5f71067da53b81e67021d87c501a6296841c78b3820fdc4eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D3 10916 bytes
font_03_sfnt_off0000cf59.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 16036 bytes

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