Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a900b3a5acb6bf4…

MALICIOUS

PDF

35.0 KB Created: 2020-08-31 18:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3ffc7f98b771c610ff8ac4235cb08ba SHA-1: 5289473b7d07a059fcb157d085a5ffbbb39de992 SHA-256: 6a900b3a5acb6bf44175d6b0a1e036ceb484c4b145c64acb54846eaf68619d0b
162 Risk Score

Malware Insights

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

The PDF contains a deceptive link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for 'past tense exercises pdf with answers'. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm designed to distribute malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=past+tense+exercises+pdf+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8fc1d8ab689b4ddcbef0ac33bed612e6.pdf
    • https://static.usrfiles.com/ugd/accd1f_23994952b5e84e64a50983c66b2d789d.pdf
    • https://static.usrfiles.com/ugd/911c12_a61a5f27a0584126bfc9358c79362abf.pdf
    • https://static.usrfiles.com/ugd/b8c837_703ffef223da4f76a51eb4bc49d24e1d.pdf
    • https://cdn.shopify.com/s/files/1/0440/6870/0310/files/paradise_city_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0434/5574/2114/files/18032369369.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/robutotesomo.pdf
    • https://static.usrfiles.com/ugd/d162e3_81cb3f24a6c647d08b6d39806b24d6ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae49135642142e999509e05cca976d6.pdf
    • https://static.usrfiles.com/ugd/ade4e6_93ea77619b854de19e819dfeaecdca22.pdf
    • https://static.usrfiles.com/ugd/fd3290_d53425e3639249d687cd8d454fe79407.pdf
    • https://static.usrfiles.com/ugd/b8c837_a97c488d32be40fe8217e8406d7f95f4.pdf
    • https://static.usrfiles.com/ugd/2f8cea_f6879b34337241488c9409ca4056cbcd.pdf
    • https://static.usrfiles.com/ugd/45e30f_adc945f1b64f41b5bee5f6170d42a162.pdf
    • https://static.usrfiles.com/ugd/e8506d_8328a93dd4154d2b959a8fdd35f33150.pdf
    • https://static.usrfiles.com/ugd/b8c837_a14da25cc78048a3a60dba82ab30c952.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_off00004a7b.bin
b545ae9cd0ebd6d37641c10f7c65bf12182e720ad1eb9e065b7f5232f8f67aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A7B 5372 bytes
font_01_sfnt_off00005cd7.bin
25837185602f88061aca8f14421018a9658e8243b308b9c7f875490c384f3b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD7 10020 bytes

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