Malicious PDF — malware analysis report

Static analysis result for SHA-256 864dd755bfd40637…

MALICIOUS

PDF

67.0 KB Created: 2020-08-06 00:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76084388f0e41eccb88b033b6f1b0ab4 SHA-1: 3ea7bc3e318a977f575926a961fe3978c3427eb6 SHA-256: 864dd755bfd4063701d099241891ea5760c4ac69c9fb0ac7868af5cb504c85f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute other PDFs. One prominent URL, https://ttraff.cc/pify?keyword=arithmetic+sequence+word+problem+worksheet+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'arithmetic sequence word problem worksheet pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=arithmetic+sequence+word+problem+worksheet+pdf
    • http://lumilawen.danieldaniel.dk/uploads/1/3/2/7/132740930/bezesodet_gukidaju_mimesaxopazoj_risemelebajar.pdf
    • http://files.lightbox.at/uploads/1/3/0/7/130739542/lozadi-fakebetu-tidufabirelifa.pdf
    • http://files.surcodmalawi.org/uploads/1/3/1/3/131381722/winagidiramiga.pdf
    • http://kegidifu.rhodesriches.org/uploads/1/3/0/9/130969744/zobegi.pdf
    • http://files.oyccweb.com/uploads/1/3/0/8/130874652/xafitubif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/sozozowujatizumofuxawi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/john_deere_technical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0621/3789/files/28392210468.pdf
    • https://cdn.shopify.com/s/files/1/0438/6937/2576/files/ffxiv_act_no_combatants.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7229/files/wilomeranuzipezukub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/gapovubidegexeremu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/lenelapotenujejuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/99289170354.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/40033849623.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/notirasagodirupemivofef.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/74294905311.pdf
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/manusia_makhluk_sosial.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/64942234042.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca9.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA9 2828 bytes
font_01_sfnt_off0000c6a3.bin
e9c87f2f115896a7008f1e7a604448d84cec118297e338e212ea070c22e154a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 5596 bytes
font_02_sfnt_off0000d991.bin
9ab99823c9b9ac6fee01f760cadae0bee0d398064811d773d46e70755b65fc15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 9964 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.