Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba1ad6a34309164…

MALICIOUS

PDF

36.9 KB Created: 2020-08-18 17:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15bdc6e876dcd1bffcf5a4a775cc9658 SHA-1: 4edd07b6177c2499a374a874b35af802483ba881 SHA-256: bba1ad6a34309164a5be04dc8d70b7f7bad779df1c089ad5e7b0071ddbc5ee57
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) that is known to host malicious content. The document body, though heavily obfuscated, also contains the same redirector URL and other PDF links, suggesting a deliberate attempt to lure users to malicious sites under the guise of providing free educational materials. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=handwriting+practice+sheets+for+grade+2
    • http://files.blackwoodforsheriff.org/uploads/1/3/1/4/131483336/nagedilatelud.pdf
    • http://fipagemi.rezabekvineyards.com/uploads/1/3/0/8/130874104/lopunedemowigoturomi.pdf
    • http://tivufugu.libertylawgroupla.com/uploads/1/3/1/4/131407089/2452239.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4831/files/public_relations_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1396/files/35969879419.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/minuxuzelemolapiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/6015/7855/files/lejavanefaluke.pdf
    • https://cdn.shopify.com/s/files/1/0433/2653/7883/files/instagram_no_modo_noturno_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/5161/4359/files/42411242538.pdf
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/2235069342.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_off00005065.bin
1ac349f86d65000549742195f70feceee33c7f0dc3b9002f3d44763799bb20ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5065 5568 bytes
font_01_sfnt_off0000635f.bin
f4e9a99163cb2151da16aab9ece9ce14542b1706402a7406e934ad6498a8a894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635F 10452 bytes

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