Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80e1277414d6e36…

MALICIOUS

PDF

44.9 KB Created: 2020-07-28 21:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e103f3bb4c8ff0b23c4e2f39861edea9 SHA-1: 2871ad90c66a02e08d6b73c48073cc683835f864 SHA-256: c80e1277414d6e365524e0fb219e70740ced8901ab0435104843e06f30aae2e1
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is designed to lure the user to a malicious site. The document body, though heavily obfuscated, contains text that appears to be a lure for a report format. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, likely for SEO poisoning or to distribute further malicious content.

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=army+ccir+report+format
    • http://files.brookewhitworth.com/uploads/1/3/1/0/131070247/97c0d220db.pdf
    • http://files.thedemeterfoundation.com/uploads/1/3/2/3/132302995/8554719.pdf
    • http://files.mythicfirecreations.com/uploads/1/3/0/9/130969885/boseniba.pdf
    • http://files.walkshop.org/uploads/1/3/0/8/130873794/20b98a5.pdf
    • http://files.artofsales.us/uploads/1/3/1/4/131408170/6ab81cfe7bc2189.pdf
    • http://files.mythicfirecreations.com/uploads/1/3/0/9/130969885/
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/mamabowo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/padibabumokusaduvok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/53007646358.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/gejujerafawenakuxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/gebezaxunojeno.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/23347005983.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/jokulepavulovipovug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96512150342.pdf
    • https://cdn.shopify.com/s/files/1/0428/4032/6300/files/38253067357.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/51054886441.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/30104708127.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/51910338106.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_off00006853.bin
0141c2b4c7adf05d3e4a151ac9083cb046e3ce89bd1f41a0e5ca16014c0f96a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6853 4724 bytes
font_01_sfnt_off0000785f.bin
2e20c00f9b640c922c0d14638a77cc3e8d049d3017937c8288490e18856754e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785F 13916 bytes

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