Malicious PDF — malware analysis report

Static analysis result for SHA-256 1457814a5b9d6bff…

MALICIOUS

PDF

40.4 KB Created: 2020-09-01 10:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46aed06cb34e60177caa89239a158819 SHA-1: ee8c339b51e6bd4920bd7d73cfd6d7403d5125d0 SHA-256: 1457814a5b9d6bffac09cadda4e1af211739f948c5fb2aad1abe7b1321e2dad7
154 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a malicious domain, disguised as an IELTS exam application form. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL. The ML classifier also flagged the PDF as malicious. The document body contains obfuscated text and multiple links, suggesting a link farm or redirection tactic.

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.club/wix?keyword=british+council+ielts+exam+application+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8311/8232/files/kiselidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8568/4124/files/25406946010.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/pekatasotovobesekiv.pdf
    • https://static.usrfiles.com/ugd/3cb679_bf2fb661e4b1411bb397ffd3d4c4838e.pdf
    • https://static.usrfiles.com/ugd/f967ac_8dd09e7791cb4c90b6d15b1d34a59bc8.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_c5ae46121d134034bc347d40565c7d60.pdf
    • https://static.usrfiles.com/ugd/b8c837_e21ebc83e53545c0992db7a8490f7f50.pdf
    • https://static.usrfiles.com/ugd/edb4a7_be832641fa6644048647fa518ebd9618.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/al_quran_bangla_translation_word_by_word.pdf
    • https://cdn.shopify.com/s/files/1/0434/2218/7685/files/49401534783.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/wonosofaximopuzewise.pdf
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/34932005692.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/lanorin.pdf
    • https://static.usrfiles.com/ugd/7c30af_4158318cf4534111a2375f291208fc4e.pdf
    • https://static.usrfiles.com/ugd/1c90dc_270d692efcdb48d49efd068fcc3dd244.pdf
    • https://static.usrfiles.com/ugd/03ae60_5786e663351443b69d2911c80d9aca96.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_off0000610e.bin
26dd32abc9dd43e8f0e4b34f3d0a50677e4bd87b7b597dfb3be70e6d05dd299e
pdf-font-stream PDF embedded font (sfnt) at offset 0x610E 5372 bytes
font_01_sfnt_off00007331.bin
5b30ba014c00e5ee2d0bc890143d18ee4e90efe1bc80de8da07a4c0132b009e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7331 9772 bytes