Malicious PDF — malware analysis report

Static analysis result for SHA-256 084667cf232b30c8…

MALICIOUS

PDF

34.7 KB Created: 2020-08-29 20:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b774009d5818f204e3dc15fce338b68 SHA-1: 78c3603828ed87b1daea908025d00ecf2fcf56b6 SHA-256: 084667cf232b30c8fb45b782ad8b7a411f8645e071ba6b03a1bc194f353b66f7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking PDF links, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure.

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.com/wix?keyword=daria+semikina+wonderful+tonight+tab
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ef1531130b8740b3b675943f0c4e103c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0b383423ed14af883722d3230e515f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_5115728ce64343c68e1683551c93fbcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_6dada1dcff33497a9e03ed2b0f4820b9.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/bharat_acharya_8085_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/lozemazowukapupuvopoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/4399089039.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7815/files/22209240625.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/fupunexakuser.pdf
    • https://cdn.shopify.com/s/files/1/0437/6936/4631/files/apocryphe_de_jean.pdf
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/satosux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/basirizimaxejaganotifajo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/78994591609.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/timagamivubomakugotaga.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/72940954447.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2105/files/valuwuxipojikawi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5145/6411/files/54303136161.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_off000048d7.bin
05bc8d2169591882b353404b9b34cc35bd49930073d5eabe21ee6a473612b19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48D7 5616 bytes
font_01_sfnt_off00005bd9.bin
15a2e01d970abd7378eec6ef30f75c29becd5e28a3f42c99eff7ddccf554b855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD9 9816 bytes

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