Malicious PDF — malware analysis report

Static analysis result for SHA-256 819ceec30ebb62f9…

MALICIOUS

PDF

42.1 KB Created: 2020-08-29 22:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb414ec6a0576fdcf9edd007fcde5168 SHA-1: 5fada071c11de9d06a30a832ccf7e3c92467660d SHA-256: 819ceec30ebb62f93e3346825999ab2b127c7958f110f07702077b53337a2f88
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a high number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://ttraff.cc/wix?keyword=the+triumph+of+the+dwarves+by+markus+heitz, is known to be a malicious redirector. The document's structure and embedded links indicate an attempt to lure users or manipulate search engine results, potentially leading to further malicious 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.cc/wix?keyword=the+triumph+of+the+dwarves+by+markus+heitz
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5025/3992/files/nibuxakogadar.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7952/files/degujamaverulinod.pdf
    • https://cdn.shopify.com/s/files/1/0432/2118/8763/files/lier_plusieurs_en_un_seul.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/takobuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5221/files/90740756480.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6d5c376767f4cbdaf1b5c0ac0765ec8.pdf
    • https://static.usrfiles.com/ugd/a18aa6_b040ee8a860340fd8865fc97f043367f.pdf
    • https://static.usrfiles.com/ugd/e4ff69_a3efed4f852d4d18adc8d71428af88cc.pdf
    • https://cdn.shopify.com/s/files/1/0429/2358/9788/files/functionalist_and_marxist_view_on_social_stratification.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/gimubesutuwuzebep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1297022614.pdf
    • https://cdn.shopify.com/s/files/1/0434/0029/8648/files/development_economics_todaro.pdf
    • https://cdn.shopify.com/s/files/1/0438/8428/2008/files/jurnal_metabolisme_karbohidrat_issn.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b398b0a866e4949ac8a67de1f87e682.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dae6cf70624488d80d3fba796d71520.pdf
    • https://static.usrfiles.com/ugd/af0aa9_25e59058387d47d69e9232b48672f383.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b8570033c1c410996df5bb174229800.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_6bf403c14727416fa8add0de0f50618e.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_off000065ba.bin
2c224f32c761c86fad2bf856fac65c3b2f46129808a24cdd01a42d23f4a2f972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 5708 bytes
font_01_sfnt_off00007923.bin
ac0eedf42d9d925fcb38bdd1717857ddc76b4034ab3e9effbd54bfe1673159cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7923 10024 bytes

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