Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b58e4bc8123172…

MALICIOUS

PDF

47.0 KB Created: 2020-09-01 13:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d160192262bb5edafb937c31915e66aa SHA-1: 5b4b808292540125bede4c271b6097304a53dfde SHA-256: c7b58e4bc8123172e9760713b5f0ebeebbe5016afdf6ea8c770b557cab0c756c
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, including a critical redirector link to ttraff.cc. This indicates a likely attempt to direct users to malicious content or phishing sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the link farm and the malicious redirector are strong indicators of 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.cc/wix?keyword=multiplication+worksheets+for+grade+2+pdf
    • https://static.usrfiles.com/ugd/77eba6_7655f19e5a0648e4860ebc965d2a9006.pdf
    • https://static.usrfiles.com/ugd/db1da1_c81a74db77aa4e68931b8f56399d3279.pdf
    • https://static.usrfiles.com/ugd/b7082a_ed39c5b960f34e1abd71cd201aec6fd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_fad2644dde6c416dadeb2f417ec578bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_d946a00d414141e79af84fb08e1ae5de.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6a4ec01ce2412d9d447d9b7fc740d1.pdf
    • https://static.usrfiles.com/ugd/1e4819_c65acfef9b604144ac953d1961b1b803.pdf
    • https://static.usrfiles.com/ugd/63d3ad_82fabc415ca742d6a7503eb82c13e789.pdf
    • https://cdn.shopify.com/s/files/1/0434/6281/9990/files/6356467539.pdf
    • https://cdn.shopify.com/s/files/1/0451/2360/0538/files/brain_teasers_worksheets_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/55949675936.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7137/files/cdc_yeast_infection_guidelines.pdf
    • https://static.usrfiles.com/ugd/1a89c8_1288f82e5955429aa1db11f26ae3292e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bf577db78e644c4beca561ddad312cb.pdf
    • https://static.usrfiles.com/ugd/24853a_529eb87b6b6f4f93b52cd4fee78fde13.pdf
    • https://static.usrfiles.com/ugd/c5d40f_64f5374b75ef4a7494dce0d08628089e.pdf
    • https://static.usrfiles.com/ugd/fbccce_618d1ac289de4e7ca5f00857266415b9.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_off00006a0c.bin
1687ce2a74c2682607d243d5f985215bcb83b76e3bd7794405e2cd70497638f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0C 5592 bytes
font_01_sfnt_off00007d1f.bin
39fdf7b097a4197050223f6294ceba345599c5d59e4476e22f4e9d08ee45bdd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1F 10364 bytes
font_02_sfnt_off0000a0a0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A0 4324 bytes

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