Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f50099c763ad865…

MALICIOUS

PDF

56.1 KB Created: 2020-09-01 05:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69d7ee4ef475f3c4fa1392435c08ec0b SHA-1: d74112e77d2ddfb5288ceea7f382293c4b58c624 SHA-256: 0f50099c763ad8653b5348df25107125e2089ca21a90a38d3512f3f5ff3145be
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it exhibits a high number of embedded links, characteristic of a link farm, with one pointing to a suspicious URL. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links suggests an attempt to redirect users to harmful 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.ru/wix?keyword=peran+cacing+tanah+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/ca32a8_801f12c919074411a655599befd4bd37.pdf
    • https://static.usrfiles.com/ugd/b8c837_083492c2e89a4c3b96d5e0ab96b34c90.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_bb292d72756f49a89d435cc58d3c7c38.pdf
    • https://static.usrfiles.com/ugd/c0fca2_e49562a67a26486397716e155fe0c3f4.pdf
    • https://static.usrfiles.com/ugd/ef253e_dfa4096cd07a4547ab6071b400152fd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_808ed6bc52454164bcfb3ea2763fa2b2.pdf
    • https://static.usrfiles.com/ugd/affb4a_255f44dc9bdf4562a072851ea2033773.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8cb6a49217443a2bd38dc59a5914f8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89691c8310846be9834a7ea135f739c.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/luboneji.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/nios_assignment_front_page_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/96535921685.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/17375298510.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0529/files/dediva.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/net_ionic_equations_worksheet_10-_4.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/bogefeliwebunilutiraxuwi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/vabimolobebexog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0457/5838/2244/files/vuvopozo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008dd5.bin
dc07e6cb494993dd0e81190e9a826a20bf1443034829f0f6b860a1ab9372988a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD5 4884 bytes
font_01_sfnt_off00009e58.bin
3a2e37dcdef7ba8751f1c4dc12ef201d86d7aa4c832b0466e4a090247c3e124c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E58 12004 bytes
font_02_sfnt_off0000c51b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 4324 bytes

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