Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b3977a9758a4bd…

MALICIOUS

PDF

48.5 KB Created: 2020-09-06 01:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f950ffb70782c9ed221cc129de8bec8 SHA-1: 2d4cfba3c5fc2f34e7ee83baf56825e4c26e8adf SHA-256: 38b3977a9758a4bd3beea4d30e90960b35dee364a4d2b50d0b388be13ea4cb49
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'weekly attendance sheet pdf' and includes the malicious URL, suggesting a lure. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or 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.me/wix?keyword=weekly+attendance+sheet+pdf
    • https://static.usrfiles.com/ugd/d3758e_cbb46977352d406e928bcc28df242857.pdf
    • https://static.usrfiles.com/ugd/bc4951_b379e2fbdeb845d0b4cc5075839258df.pdf
    • https://static.usrfiles.com/ugd/078c79_ff1d90f92bdc4b56820e8089f864729c.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/87345193242.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4634/files/bragi_the_dash_pro.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/fefetezetilawezugafatejoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/45826531384.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/goldstein_classical_mechanics.pdf
    • https://static.usrfiles.com/ugd/296484_8a49b877dd73448799bc90660ec9aff9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6902fd47bee947a9aeb8e43c9f1216b1.pdf
    • https://static.usrfiles.com/ugd/0dd040_389baa2ec75641a4bd6d6818d5578495.pdf
    • https://static.usrfiles.com/ugd/21e6f2_44a7821794964a99944cecdbfd6fb02c.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/comprehensive_report_about_drug_tik.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/mikaloxitipi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/10206005592.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/21308752762.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_off00007254.bin
ef405b862d6eb03731c57d30820c9d8e52b669c53c4ee92f174f84163d536135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7254 4956 bytes
font_01_sfnt_off00008342.bin
d7bed619e26f62d29ec4559a78505dbd7660317172ca6bcb968591405eb66465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8342 10400 bytes
font_02_sfnt_off0000a691.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA691 4324 bytes

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