Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c147d4ca4ac9391…

MALICIOUS

PDF

46.6 KB Created: 2020-08-10 16:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 890fa9ee2bf4faed91f7390ffa4431b4 SHA-1: 10ef86ac78721ff78d8c61cc1c51348e36e0879c SHA-256: 5c147d4ca4ac9391baac9a3926dcf833b95592839399f08c11a690aac9d04167
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also hosts a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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=math+teacher+s+guide+grade+8+pdf
    • http://files.nlfarchitect.com/uploads/1/3/0/8/130814298/xelovowobutijutodod.pdf
    • http://files.bonairetaxi.net/uploads/1/3/1/4/131406258/gifokokowero.pdf
    • http://files.lucerneinternationalfilmfestival.com/uploads/1/3/0/7/130738806/misapamefikaga-wilimegepab.pdf
    • http://geromegij.learningbeginsnl.com/uploads/1/3/0/7/130775274/1d7d190d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/48145523795.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8726/files/vemuxumux.pdf
    • https://cdn.shopify.com/s/files/1/0436/9632/4758/files/41944681123.pdf
    • https://cdn.shopify.com/s/files/1/0446/8791/7209/files/athlean_x_xero_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9966/9151/files/caracteristicas_psicologicas_del_adulto.pdf
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/favodobuletod.pdf
    • https://cdn.shopify.com/s/files/1/0434/7576/3353/files/java_web_services_book.pdf
    • https://cdn.shopify.com/s/files/1/0448/0499/7271/files/honeywell_programmable_thermostat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/sixunomaxijajig.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/15083459629.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6823/files/25354214205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/18321640216.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15843942414.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000782a.bin
1e22795d04200b395fc073d33458b4fcb682219d226e218350451af662cf0735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782A 5584 bytes
font_01_sfnt_off00008b29.bin
b30315974c117438f413b13b51db97cbd9cfc23cff8df446673728e03184d951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B29 10052 bytes

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