Malicious PDF — malware analysis report

Static analysis result for SHA-256 b714edd14924dcf4…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 09:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d222fc75ce9f53f7aa47ae8978beb9 SHA-1: 39546bc342ece5332c1ba47984ef3a3d4248fb3a SHA-256: b714edd14924dcf4cbd8b528a008547cf06bd870083de37d7d912b31db1bbaac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=reading+comprehension+exercises+intermediate+level+pdf'. Another critical heuristic identified a PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URLs, reinforcing the malicious intent.

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=reading+comprehension+exercises+intermediate+level+pdf
    • https://static.usrfiles.com/ugd/5ed537_fb498888523947d9a8690bf5ff4a13ed.pdf
    • https://static.usrfiles.com/ugd/136d07_876301a01249453e8f12b41a667646cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ab057cb3f5448f79db5af0863f7287d.pdf
    • https://static.usrfiles.com/ugd/eb6612_ec9df1c23f304828a49289b1f5e9198f.pdf
    • https://static.usrfiles.com/ugd/d902bb_2e178827bf9943fab11803f93fca3b9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_de82ef8dd8774e5a86d629f3711181a5.pdf
    • https://static.usrfiles.com/ugd/ae059d_274dc18a1d2c46a5b70104c55ee59886.pdf
    • https://static.usrfiles.com/ugd/b8c837_86be33b931344efba0f429b74e7e9e4c.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/57630788562.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/milwaukee_15_day_forecast.pdf
    • https://cdn.shopify.com/s/files/1/0436/2089/2834/files/what_a_beautiful_name_hillsong_worship_chords.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88f6bb11769459da3e4ecc773490466.pdf
    • https://static.usrfiles.com/ugd/0049ca_d3307c15c2ef4ae0b51ae2b4ba976c36.pdf
    • https://static.usrfiles.com/ugd/9d869b_7c9e314b339e48d48078b1c9e5ebb89c.pdf
    • https://static.usrfiles.com/ugd/b8c837_dac20c1629db4edea42acf905b7e44bf.pdf
    • https://static.usrfiles.com/ugd/cdb50c_35d0fe9796384c5b8e16d5ca0ddb377b.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d5e.bin
5da9a0250ff9379e3abe3e89236651c37f053dcbc8e196722400dadba95626f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5E 5492 bytes
font_01_sfnt_off00006fe3.bin
40f5ffe285cc70bd22369cf90d007d6fe939c36207aaadd9fa259d6595798583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE3 10368 bytes
font_02_sfnt_off0000933a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933A 4324 bytes

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