Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f9123d71cb3789…

MALICIOUS

PDF

58.9 KB Created: 2020-08-30 03:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f5c1d5ea3d2e23ffd01d899b0411858 SHA-1: 99ba923ac2d4d2f38eaf99e60fe3f18d0123b94b SHA-256: 43f9123d71cb3789e33b9d24132b21462e8709d452c49d1b6297509152269218
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=minecraft+guides+pack'. This URL is embedded within the document body, disguised as a Minecraft guide. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting a broader campaign to drive traffic to potentially malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=minecraft+guides+pack
    • https://static.usrfiles.com/ugd/d1c05f_4ec9b5b753d64d2383c6372ace10a3a1.pdf
    • https://static.usrfiles.com/ugd/e5a943_0c79f492074d4346943411eecc34b8ea.pdf
    • https://static.usrfiles.com/ugd/76de1a_05361526b6044676bda53ac0b9d04ef9.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd0b3a0287df4e118ca475ca41038545.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c0452be10fc494bbbe4d85771ffaf5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f46c139bdfcd41d4b65fa8e75fc6a16c.pdf
    • https://cdn.shopify.com/s/files/1/0428/6437/8022/files/fender_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/cora_cooks_pancit.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/32474325268.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/90386801093.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/passion_pizza_liverpool.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/jiberov.pdf
    • https://cdn.shopify.com/s/files/1/0432/8715/0752/files/taxeludex.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_off00009b84.bin
e3491b412174a6dc6a70f4e4f05ea9e254540997de40565f0f9865bd8457557f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B84 5132 bytes
font_01_sfnt_off0000ad05.bin
f370daa288639bca61dbc7f723f75925d3af7fd6791390f45d948fba931a2073
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD05 10644 bytes
font_02_sfnt_off0000d0dd.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 4324 bytes