Malicious PDF — malware analysis report

Static analysis result for SHA-256 38aad665498fd109…

MALICIOUS

PDF

42.4 KB Created: 2020-09-08 10:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf8d928cad78804fdd5ea35d9557adce SHA-1: 830ad652bb552cd4566096bffac2387824ecdfc2 SHA-256: 38aad665498fd109c1c8fd32bd9d75a1e136c21fd5f37699f223473fc6881bb3
136 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.me). The document body, though heavily obfuscated, contains text suggesting it is a 'Microsoft excel check register template' and includes a call-to-action phrase, aligning with a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links also suggests a link farm tactic.

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.me/wix?keyword=microsoft+excel+check+register+template
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/byu_independent_study_login.pdf
    • https://cdn.shopify.com/s/files/1/0461/9108/3678/files/guzogexawunajoni.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/66653213688.pdf
    • https://static.usrfiles.com/ugd/0bcf16_5850977a2a704f67abdf14935d124088.pdf
    • https://static.usrfiles.com/ugd/fb5067_e39c4af0ab4f4c91a5322cdcb6f8a1b2.pdf
    • https://static.usrfiles.com/ugd/834936_47db8684455e448abb7830ca80cdec0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_94d1eeb7fd034497af3b7c906dfa0032.pdf
    • https://static.usrfiles.com/ugd/f4de5e_8e48243eb658475fa2ebc9b953962963.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/80944816080.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2690/files/55154539079.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/peketuwawiradawe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7152/0409/files/tibejimuwod.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/fetal_doppler_ultrasound.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000670d.bin
3e98782385f3c5137a222a1d0603b522c53ab68e02463fe1417f1e42199172e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x670D 5568 bytes
font_01_sfnt_off000079e6.bin
e8ed10cca41f878af4120f5de29d8462f4f29732c152ea40ec882285303f8235
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E6 10268 bytes