Malicious PDF — malware analysis report

Static analysis result for SHA-256 9748a6806450861a…

MALICIOUS

PDF

50.1 KB Created: 2020-09-02 09:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d639f705dae911cc03869b3786388e SHA-1: 34e3f6b6ecc539912fd4aecc87a43051b423eb1b SHA-256: 9748a6806450861a7cbf1964b8fbd66977929358a7a1abac4809819dfaa473ab
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and text related to a 'bride groom speech template', suggesting a social engineering lure. The ML classifier also strongly flagged this PDF as malicious.

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=bride+groom+speech+template
    • https://static.usrfiles.com/ugd/e0d0cf_10a5559fe5f740f3a6a231181924741d.pdf
    • https://static.usrfiles.com/ugd/e745be_7dee147049d24da68f7056313b0ae40b.pdf
    • https://static.usrfiles.com/ugd/694d5d_da82c94ed6db48b9a0203e08f0cdcded.pdf
    • https://static.usrfiles.com/ugd/36f25b_c03947f178fe48b991d245ec28c0538b.pdf
    • https://static.usrfiles.com/ugd/19ce5d_4c3c40adff3748a08f3eb6067c7ade4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4b4e6ad63e74aae84127cfbd282512b.pdf
    • https://static.usrfiles.com/ugd/98e298_62e761764ad04b46bab114063695a2a1.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/36352182711.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/fitidenitopi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5401/3336/files/51963208107.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/solution_architect_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/4768/1191/files/http_whatsapp_app_._com.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/nomiwu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1059/5748/files/21951782170.pdf
    • https://cdn.shopify.com/s/files/1/0428/8934/7228/files/abbreviation_list_of_computer.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_off000085ec.bin
8c03a7b8ed3a13457694e235f859adb349b2bf3815940ae08466cfffde2e54a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x85EC 5536 bytes
font_01_sfnt_off00009898.bin
d8b8a4988e1af014bc02110b3662d8503fdfa2e19de50a7bcd03356879e9ac44
pdf-font-stream PDF embedded font (sfnt) at offset 0x9898 10224 bytes