Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceffddcc3f0dd274…

MALICIOUS

PDF

46.0 KB Created: 2020-08-08 19:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee143a63f3adb4c36bda3832cb499aa1 SHA-1: af9a9ad9e6e2f3bfa289677dc9e41f7a2d49010c SHA-256: ceffddcc3f0dd274949e6b9eff0b1755cb0b649d3dfa7f76b534c69d4c175340
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm with 16 external PDF links, including a redirector to ttraff.com. The document body text and embedded URLs suggest a lure related to "Millennials at work pdf". The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing the user to a malicious URL via a deceptive link within the document.

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.com/pify?keyword=millennials+at+work+pdf
    • http://files.debbiepenz.com/uploads/1/3/1/8/131872055/demetu.pdf
    • http://files.profedenham.com/uploads/1/3/1/8/131856907/xoxirubeduturix-kivenotinajoxa-waliloponibat.pdf
    • http://files.rawdiamondhair.com/uploads/1/3/0/7/130775977/1685669.pdf
    • http://files.exploringthesacredmystery.com/uploads/1/3/1/3/131398560/6624333.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/junarimubazivudomoxesasav.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/sap_basis_black_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/www._prodigygame._come_play.pdf
    • https://cdn.shopify.com/s/files/1/0450/7769/2581/files/pasion_segun_antigona_perez.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/savoxinakewamelususovit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/82883504640.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zukukujumifuxutage.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/2423140783.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/vikuzukevidojinuxajevunoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3151/files/pekitafovuvikibojaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/entanglement_entropy.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006966.bin
462dc661946a3b49ac248556435241f5f790cfb9a1774ff91ea8d5bd871c8832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6966 4984 bytes
font_01_sfnt_off00007a79.bin
beb6f2d695171370e0ec2e916116508c2c194ac2d4539ff85869915919573b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A79 10052 bytes
font_02_sfnt_off00009ccf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCF 4324 bytes

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