Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b8f312e24f1770…

MALICIOUS

PDF

45.0 KB Created: 2020-08-08 21:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5539f83c5c24cb96d554d4826dc6dc75 SHA-1: bbe0523e864cd80f77e43401102e51f8e0337cd0 SHA-256: 10b8f312e24f177048262d95287babdc04acf78baf3f014b86b4a66d170ff365
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded links, masquerading as a hotel system manual, which is a common lure for phishing or redirecting users to malicious sites. The primary malicious indicator is the link to `https://ttraff.ru/wb?keyword=ifca%20hotel%20system%20manual`, identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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=ifca%20hotel%20system%20manual
    • http://files.karlrichardolsen.com/uploads/1/3/0/9/130969984/8472270.pdf
    • http://files.theovercoming.org/uploads/1/3/1/3/131398323/cc3ac.pdf
    • http://files.alifeworthliving2.org/uploads/1/3/0/8/130874318/lenalaw-fowez-legojumafixixin-tunotababivofen.pdf
    • http://files.mylittleretreatspa.com/uploads/1/3/1/4/131453006/68477b567.pdf
    • http://tubupe.hopkinselks.org/uploads/1/3/2/6/132682076/jaxikabetojaz_lobetepikuradi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8669/1998/files/personal_hygiene_and_sanitation.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/wakip.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/26315622067.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8067/files/88961003982.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/69478932782.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/tutorial_manipulasi_photoshop_pemula.pdf
    • https://cdn.shopify.com/s/files/1/0433/7064/3614/files/30285678203.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/jeffrey_archer_best_kept_secret.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/aisc_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/19216992717.pdf
    • https://cdn.shopify.com/s/files/1/0434/7559/9524/files/91146135658.pdf
    • https://cdn.shopify.com/s/files/1/0437/5927/2090/files/nizilisomozanefasorazi.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_off00007291.bin
689f6d7d20e09cc7f1a5c8caaa2bd42a32d10e99480d78bfcf8b107cf413e9b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7291 5064 bytes
font_01_sfnt_off000083b6.bin
390240805caa655835d69f13c98540cc847faeccc65e06fb5893d5c032640707		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B6 10420 bytes

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