Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d61ecb833a2cf3…

MALICIOUS

PDF

80.6 KB Created: 2020-09-01 00:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dc1f29e02f5661b1f7c674154ba0bff SHA-1: 5ff087b56b98f26672d113cf09aaaee958d82ac1 SHA-256: 33d61ecb833a2cf383eace5b122e49857d91dba796cf7fb2f8311f2ab20d5a5a
152 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 pointing to 'https://ttraff.cc/wix?keyword=tv+guide+tonight+chicago'. This URL is presented within the document body, suggesting an attempt to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The document body itself contains garbled text but includes the malicious URL, reinforcing the redirection attempt.

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=tv+guide+tonight+chicago
    • https://static.usrfiles.com/ugd/7198c1_fb6c428959fb426ebb4682e057e944e4.pdf
    • https://static.usrfiles.com/ugd/963627_692ff186486f441ba7ae2f59814888d4.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_b4c96b6904f74ac6a3cd677f24c011ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_e31ddc96d9e74001a29a6b804284a459.pdf
    • https://cdn.shopify.com/s/files/1/0431/7138/1405/files/34628780531.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/74772843930.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8683/files/pdf_ebook_reader_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2630/files/rosarexexake.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/types_of_nanosensors.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/esr_in_haematology_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/69103145534.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/zavikiwofowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/foposepinuduwa.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_off0000f11d.bin
a08ad4b3ce2e8366869f2704606fe6700dd9d0b51c259c1f92a55b65bd8e5921
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 4784 bytes
font_01_sfnt_off00010162.bin
aec3bc16183ee3bcb4d53670e7adfa9674d187a379da74a2faddad99501eb8c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 11088 bytes
font_02_sfnt_off0001271a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 4324 bytes