Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e556d729082d32…

MALICIOUS

PDF

44.2 KB Created: 2020-09-02 23:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c4c087bc99a5162a83b2e06fab35bf SHA-1: 2ab830758370780ccb17bec0660c265fdc70a4b6 SHA-256: a9e556d729082d3252ec797284c4261aa92935e3fa5b7d63b1872ce50aa082c6
128 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as '8th grade fsa math practice answers'. This link, when clicked, leads to a known malicious domain. The document also contains a large number of embedded links, many pointing to static.usrfiles.com, which is likely part of a link farm to improve SEO for malicious content. The presence of a visual download button further supports a social engineering lure.

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.
  • 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
  • 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=8th+grade+fsa+math+practice+answers
    • https://static.usrfiles.com/ugd/197ed4_59f97101eaf04c29981caf1fb11c1318.pdf
    • https://static.usrfiles.com/ugd/7ff653_64907f7bd980491d8d96b3fff81892df.pdf
    • https://static.usrfiles.com/ugd/3b6424_92cb7b1659d847fe936acfbef1c5f572.pdf
    • https://static.usrfiles.com/ugd/a2e20a_1157583de9f8483792debcd6750aa1bb.pdf
    • https://static.usrfiles.com/ugd/74147a_74806771d2464aa7a6aa3c36a111ea46.pdf
    • https://static.usrfiles.com/ugd/12745a_5eeb0445039446d5bd9e8995dddfaa15.pdf
    • https://static.usrfiles.com/ugd/decf6f_3703595982fc4825bb05d1464d857404.pdf
    • https://static.usrfiles.com/ugd/6203b9_4fc5db8ca87a4cbf84101eb377981318.pdf
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/pawifinibowubumepomi.pdf
    • https://cdn.shopify.com/s/files/1/0454/4974/0438/files/buet_admission_result_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/los_temerarios_te_hice_mal.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/zojopisuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9507/files/22842126430.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7160/files/bruno_munari_design_e_comunicazione_visiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/women_s_calvin_klein_underwear_size_guide.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_off000060dc.bin
539000688c524e9226aa392ee4b2c05e62a8b64f736adb0737749cdf8fb7f5bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x60DC 5408 bytes
font_01_sfnt_off0000732b.bin
48bb61a9bddde18a75914a81b004022df77decce6881bc6a978e2cddd81197c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x732B 10252 bytes
font_02_sfnt_off00009605.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9605 4324 bytes