Malicious PDF — malware analysis report

Static analysis result for SHA-256 86282560988d8749…

MALICIOUS

PDF

43.4 KB Created: 2020-08-16 22:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3d938f1aa539d089db3f3e0ae52feb0 SHA-1: c7848419318ba276b3e956c42663b64e0788e2bc SHA-256: 86282560988d87498a0301829d04350a61002539ff57bb6c3f2c094d654eef83
194 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to potentially malicious or redirector infrastructure, such as 'https://ttraff.ru/pify?keyword=kronos+electronic+timesheets'. The document body text, though garbled, includes the phrase 'Kronos electronic timesheets', suggesting a lure to trick users into clicking these links. The presence of a large number of external PDF links indicates a link farm, likely intended to distribute further malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=kronos+electronic+timesheets
    • http://files.beulahcenex.com/uploads/1/3/1/3/131384567/42739865abdef.pdf
    • http://zavurawen.meetthemessenger.com/uploads/1/3/2/3/132303195/66ed9c3f3745ab1.pdf
    • http://vamipajit.mericakaydesign.com/uploads/1/3/2/6/132681504/5440915.pdf
    • http://files.barbaradunn.com/uploads/1/3/1/4/131437380/029d65630.pdf
    • http://files.privatecounsellingandmediation.com/uploads/1/3/0/9/130969184/cea1c53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/98700269424.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/ravimugomajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/nielit_ccc_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/puxorenuxonupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/97825764457.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/ailing_planet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/matebugaguwezunakajofaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8424/files/xudolemudewanukamuki.pdf
    • https://cdn.shopify.com/s/files/1/0449/3551/2232/files/38828587517.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0429/files/cambridge_primary_science_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0447/0882/3193/files/adjetivos_demostrativos.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/bumamozerutonidepu.pdf
    • https://lifewithoutbarriers60.sharepoint.com/si
    • 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_off00006c8c.bin
ef3af89c5a8d4d784cc804c27f24d1baac870a91acd7e02b66a3dc06c853e334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 4800 bytes
font_01_sfnt_off00007caf.bin
34078f554936638935fc83f39e4e3f2d9a4af73e88644e17ad508b2e15d6d9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAF 10572 bytes

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