Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e9d150f9eed93b…

MALICIOUS

PDF

47.6 KB Created: 2020-08-04 17:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8757400f7590dcc3c0d1308c87ca1e6 SHA-1: e802d68399b32e0dfe626786c7c67bcbd4480476 SHA-256: 87e9d150f9eed93b3c2ba4c79966da22a1f56b5292afe1a08f66b6df4ae9c368
152 Risk Score

Malware Insights

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

The PDF contains a link farm of external PDF files, disguised as a tourist map, to lure users to malicious infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=cameron+highlands+tourist+map+pdf, which is flagged as a known malicious redirector. 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=cameron+highlands+tourist+map+pdf
    • http://files.catherinereilly.com/uploads/1/3/1/4/131483138/3803139.pdf
    • http://files.genevieve-simon.com/uploads/1/3/0/7/130775866/semusidodabasovigup.pdf
    • http://files.shopeight19.com/uploads/1/3/1/4/131438490/5297002.pdf
    • http://files.peterandjohnepiscopal.org/uploads/1/3/1/3/131383648/1124578.pdf
    • http://files.westfieldkennels.co.nz/uploads/1/3/1/6/131637374/80f09badf0.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/topufupegiporutudujijime.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/wotukinekegoleveresozozos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/53363579451.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0605/files/nesadakebip.pdf
    • https://cdn.shopify.com/s/files/1/0431/9258/2293/files/6082318035.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/fakojaluvujafariv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/xufumuvutasamexi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/kakefere.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/83201301778.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_off00007ab8.bin
71743d1e83eb0c47fc90bfb2c5c69ffc2c8b4d1e7ac37754b904ca746d68d310
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB8 5360 bytes
font_01_sfnt_off00008cc5.bin
b937e361704ff479619d3e2b4bb490d1d9f2c1b800f5956084f559cc0c050dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC5 10764 bytes