Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b51edc7448ca36…

MALICIOUS

PDF

45.6 KB Created: 2020-09-01 06:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 932058933b279fd32d99a17c0537a187 SHA-1: 225a1c747c6daf0445d78ed1179b36ca2f9f81eb SHA-256: 09b51edc7448ca36705f694d0d4c96fd8cac24e00ed0b627cdae3db3ccedf732
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body and embedded links suggest a tactic to manipulate search engine results or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead users to harmful sites.

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=cerita+anak+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/partes_y_funciones_del_cerebro_humano.pdf
    • https://cdn.shopify.com/s/files/1/0432/6365/6099/files/libgen_io_down.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3434/files/simple_english_speaking_course.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8833/files/xivaburemujagevolurudof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/vaweden.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/rirabikurelupunovanavibon.pdf
    • https://static.usrfiles.com/ugd/6260fe_1b7df1bce16a4e18a41e79ca928c5f0f.pdf
    • https://static.usrfiles.com/ugd/5a1791_450dfd1c35924cb6bd3f652b67060906.pdf
    • https://static.usrfiles.com/ugd/ef253e_85cd0df9060b4ba693f9e3e9edebc567.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/zojasewoluterujiki.pdf
    • https://cdn.shopify.com/s/files/1/0436/9429/3142/files/75511038389.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8053/files/most_common_adverbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0439/3448/2587/files/immersive_first_person_view.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_off00007975.bin
61c2314e7d66121db54ee34dd255e3d251b5a0769327d7d40f8596d115ad0b02
pdf-font-stream PDF embedded font (sfnt) at offset 0x7975 4792 bytes
font_01_sfnt_off000089d3.bin
04a8660d5839141616bbee6a85e9aa209395f87189a9f5b0ae192fd60cdc75f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x89D3 9472 bytes