Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d53d478456b768…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 04:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cd4d16320ddc3a424bd01b18d6cd978 SHA-1: f9866e19cdb172ec5a41b53f66a4121822d8d9bf SHA-256: 10d53d478456b768caea025cf8bd556848e9756f694845bda084791553ec35bc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links redirects to a malicious domain, likely intended to deliver a secondary payload or phish the user. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a malicious intent.

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/wix?keyword=sandeep+aur+pinky+faraar+full+movie
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_aa0ba7b175c2460bb63e320da8ee3f53.pdf
    • https://static.usrfiles.com/ugd/e32576_6eb507b910f041a7a3a768f4184cb42c.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_3aac99c3656c49a1aecd8b5ef7cc278f.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/ravefumajukituwolilaneva.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/78883798613.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/90042112220.pdf
    • https://cdn.shopify.com/s/files/1/0435/3766/2103/files/siregemewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/wuxaji.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c72998f81a24045ab070bbb986368ff.pdf
    • https://static.usrfiles.com/ugd/3e87bf_c742ebc7599d4067b3ca37874d18ead6.pdf
    • https://static.usrfiles.com/ugd/269bb8_1ceb24294bf54656abb5a75b7251b974.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8f2906ae8a04caa8d393c15974df4cc.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1070/files/nasunepinanumotafar.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/autocad_clip_frame.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/important_current_affairs_2020_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/present_ministers_of_karnataka.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_off00005de3.bin
172979f46c1c52cad8bc60b95f27775e21d1ec7023c8bacbbeb6d38a7eb215c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE3 5340 bytes
font_01_sfnt_off00007001.bin
344b37d0800ef324b97a721b0c333ee19165c29b0f41f51785bbabf22964a29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7001 10556 bytes

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