Malicious PDF — malware analysis report

Static analysis result for SHA-256 761e0527e30284d9…

MALICIOUS

PDF

41.3 KB Created: 2020-08-13 16:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 308fa24ee87841d87b9747abf4e52e46 SHA-1: fd88b36c9a293b7bde8503a3862e84d8e6e46e5c SHA-256: 761e0527e30284d9649ca9cafbd560109a8e3773de81078a4bb163b912b50d0d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with one identified as a malicious redirector. This suggests the document is designed to lead users to malicious websites, likely for phishing or to download 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.ru/wb?keyword=cpns%20kab%20tasikmalaya%202018%20pdf
    • http://files.shiningstarva.com/uploads/1/3/1/4/131454172/1901447.pdf
    • http://xiduzopo.silverfernflag.org/uploads/1/3/1/6/131607062/d44071.pdf
    • http://vefenu.milliesjumps.com/uploads/1/3/1/3/131383483/febidoz.pdf
    • http://files.sthlmtapas.se/uploads/1/3/0/9/130969424/70aa62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9357/3288/files/silasosovuxir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/38027499880.pdf
    • https://cdn.shopify.com/s/files/1/0432/0473/9232/files/aula_de_espanhol.pdf
    • https://cdn.shopify.com/s/files/1/0434/9417/8982/files/55891764274.pdf
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/21872075943.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9369/files/zagufanilifonikebope.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/tavutaduvinegirir.pdf
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/76247600948.pdf
    • https://cdn.shopify.com/s/files/1/0431/5516/1252/files/viwajokavizujasoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/present_perfect_with_already_and_yet_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/mexaditiropabudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1808/3742/files/definicion_de_administracion_hotelera.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/59725359762.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/51136142297.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_off000060e9.bin
a69c01b82f49763f533f92f8cca3cd970061aa2948564c6eaab1c39f809b0322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E9 5820 bytes
font_01_sfnt_off000074ad.bin
01a779f619413effddc95559f2aa9a889c2f7e554f0585bc2d45ea22d85c8a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AD 10532 bytes

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