Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a191da78f6b34ff…

MALICIOUS

PDF

40.7 KB Created: 2020-08-30 22:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b504e2c78f443e285c1ddeca02bcc0c SHA-1: 1f8d2a04f8dd96805dc912e0929d7716e1c1d4f4 SHA-256: 6a191da78f6b34ff9f338a0e7378727a55c84845e4c810170500a165095d4805
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that matches the redirector link found in the heuristics. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing.

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=math+154b+solving+using+the+quadratic+formula+worksheet+answers+with+work
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c20ea7_79c303bc62fc4e1caea9e94ca502ca95.pdf
    • https://static.usrfiles.com/ugd/837d34_4d078217f7744eca90115700937e3ce3.pdf
    • https://static.usrfiles.com/ugd/822ecd_42919a3884104d14936d31bb5c6ce809.pdf
    • https://static.usrfiles.com/ugd/b8c837_e268caaef2da41fcadac0c154334b4f2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xirapekewovefosisukepeja.pdf
    • https://cdn.shopify.com/s/files/1/0448/2826/2560/files/bullers_wood_sixth_form_prospectus.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/velekuraj.pdf
    • https://static.usrfiles.com/ugd/b58d21_ade4d7156ff0432eae6a6da443e99fa6.pdf
    • https://static.usrfiles.com/ugd/df4650_939ed1eddaac4dda8380ba91ca6880a4.pdf
    • https://static.usrfiles.com/ugd/e643da_0efd9f617534480f889c048a88ec3655.pdf
    • https://static.usrfiles.com/ugd/8de238_7899e99654b740bea39f15d77110e563.pdf
    • https://static.usrfiles.com/ugd/9219f8_fc2bf1d27b624b82befecb9a21208296.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/vomiting_in_infants.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/angamaly_diaries_full_movie_cinemavilla._net.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/jidojogesasu.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_off00005d66.bin
8ded1fafb1e294e12c2ae566a3d40e6aa398a6c1734ca2206e65244358ec87cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D66 6188 bytes
font_01_sfnt_off00007267.bin
ae976ca1e5cd1d568e867456f14ab0c38e3fff295adc338948e7ad645995d9a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7267 10236 bytes