Malicious PDF — malware analysis report

Static analysis result for SHA-256 e787bad39815d0da…

MALICIOUS

PDF

80.6 KB Created: 2020-07-29 15:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09d2e66ccc4ae0d24b52dd2654cab1cf SHA-1: bad74262bdd051b1cb74bd5233f87d29f42c5f4c SHA-256: e787bad39815d0daea643c15a15f468ac3ae960606dfb4b991449cc7d4f00753
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'Phased array antenna basics pdf', likely intended to trick users into clicking the malicious links.

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=phased+array+antenna+basics+pdf
    • http://files.dgbcgolfgala.com/uploads/1/3/1/3/131379832/nurunaza.pdf
    • http://files.jameslpoole.com/uploads/1/3/0/7/130775309/mabel-muwodixot-mokovu.pdf
    • http://files.thriftbox.org/uploads/1/3/1/8/131871466/xijuremi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/56373318166.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/51812765759.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/49389329152.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/43029527909.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/80756289858.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/58666001531.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/pakizezujex.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0643/files/nudogiveza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/sanoxodaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/falimuredokujo.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_off0000dcf9.bin
4635ecc88c51a6ce9adf54996f3aa27a8fe7167473a6ffec4de17886b8375797		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 5132 bytes
font_01_sfnt_off0000ee5b.bin
1091fa07d1f9601eb7891fb475231a7ca41c4eab937bbd615bd4ec5713c638b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 15480 bytes
font_02_sfnt_off00011f69.bin
a31d0161e0f32937c5034a1deecdd32ea9273e14fb083575aa56b5f7670e8c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16156 bytes

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