Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d87b66fd0d3800f…

MALICIOUS

PDF

49.0 KB Created: 2020-07-31 10:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec019b42aed40700bcb1621f0254e3ae SHA-1: 48fa45f4e51d835af8fe52c311108dc36272a77b SHA-256: 3d87b66fd0d3800f6104ac480d84aec155d43b58e546fe84c2e2dde73b672059
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is used in conjunction with a lure document titled 'Fiche de paie octobre 2020 pdf'. The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm for SEO poisoning or malware distribution. The ML classifier strongly indicates 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.com/pify?keyword=fiche+de+paie+octobre+2020+pdf
    • http://files.apostolicdeliverancefive.org/uploads/1/3/1/1/131163904/2916a.pdf
    • http://files.blinkgatproducts.com/uploads/1/3/1/3/131398308/6133949.pdf
    • http://files.tynksgemstonedesigns.com/uploads/1/3/2/7/132740415/7381d2f1749d4.pdf
    • http://files.stoneharborpawprints.com/uploads/1/3/1/3/131380008/e499c118d72ae.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3625/files/bapilujiwibave.pdf
    • https://cdn.shopify.com/s/files/1/0437/9072/9377/files/51101002739.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/bipiwijimub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/kunorulalapasidibulekenem.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/pojosuzefosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/77050930618.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/gaxenixizasanurex.pdf
    • https://cdn.shopify.com/s/files/1/0440/2577/4245/files/57957789221.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3961/files/51028516601.pdf
    • https://cdn.shopify.com/s/files/1/0431/6718/7108/files/58795599889.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d49.bin
1559b214e926dd9378e1f6589e4ce1b45e34b5b869586e53ee57b7f3fc3d0ac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D49 5084 bytes
font_01_sfnt_off00008e99.bin
60004d083107438374277634bd6ae0ca82aa4b86fd2104de5de53a74434ca7fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E99 12552 bytes