Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d5703b9b2fbd75…

MALICIOUS

PDF

43.9 KB Created: 2020-09-01 18:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0e7e5f09045486ad1659e0b4e689580 SHA-1: 95c68adbc603e7e43624129f337f2eb3cfc5a971 SHA-256: f8d5703b9b2fbd75105ab735b574a7ef7c4639d70911f8c507524779f1963c5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.club/wix?keyword=practical+english+usage+pdf+new'. This URL is likely part of a phishing or scam campaign. The PDF also contains a large number of links to other PDFs hosted on 'static.usrfiles.com', which is flagged as a link farm. The ML classifier strongly indicates maliciousness.

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=practical+english+usage+pdf+new
    • https://static.usrfiles.com/ugd/ce77c6_087f0848d1c549eebdfd563357b8f810.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef542ec166994c67846a15a9a62696dc.pdf
    • https://static.usrfiles.com/ugd/895bef_49dce3bfc35941be922671ef4fae02a3.pdf
    • https://static.usrfiles.com/ugd/451a43_e4ea1588978c4818a31df7499feebe2a.pdf
    • https://static.usrfiles.com/ugd/50de67_028b7ec1a37c47b99c8be1e64816fa22.pdf
    • https://static.usrfiles.com/ugd/c1de29_b576e22f0ba7411c840184daaf7da276.pdf
    • https://static.usrfiles.com/ugd/c8d394_7bdfa71bd5be48c9beeba99b01b94f5f.pdf
    • https://static.usrfiles.com/ugd/8cbfce_88d2d0d5934845c4926819d2125feb62.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/harpercollins_study_bible.pdf
    • https://cdn.shopify.com/s/files/1/0436/7931/8166/files/kuzidipelitorexuzuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/yellow_chords.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/engineering_chemistry_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/jewelanefolajerovubikuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/wutovobitusati.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/63919650760.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_off00006069.bin
aa0f13156bf8ad03ed906a8bbbbbd05811962a0f0a51b7fb14b900fe3ef0179c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6069 5280 bytes
font_01_sfnt_off00007258.bin
495c4b8f204dd13e61f4b379b2cb3a0d344253179ae5ccb249a5dc09cc9625a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7258 9960 bytes
font_02_sfnt_off00009464.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9464 4324 bytes

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