Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a46eb40be88840…

MALICIOUS

PDF

42.0 KB Created: 2020-08-16 10:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a1d9568b6c4042b1ccedfa9394bbee SHA-1: d9e4dde6928bee53bdec6147687759c12ce9d8e5 SHA-256: 05a46eb40be88840cdb7953a83a06a4e7e0eac6daf7e9de2f3b792d7f95a73f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Expectation to the company best answer' and the authoring application 'wkhtmltopdf', suggesting a lure. The presence of a malicious redirector and a large number of external links indicates an attempt to drive traffic to potentially harmful sites.

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.com/pify?keyword=expectation+to+the+company+best+answer
    • http://files.lindentreewater.com/uploads/1/3/1/3/131378774/8086966.pdf
    • http://files.counterpointstat.com/uploads/1/3/0/9/130969735/sibizereze.pdf
    • http://files.create2day.org/uploads/1/3/2/6/132682039/9907398.pdf
    • http://fajiwoju.divingtokyo.com/uploads/1/3/1/4/131454859/f00059980.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/realismo_mexicano.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0424/files/jupukok.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/buraxumi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/jisegaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/liximizifilazodav.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/84025618805.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/sokufemerojigenedibesam.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/xugibenusizeroxemenuso.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8501/files/futoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/31953556406.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/bavizazu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006773.bin
9ba825096578e1522ff8f12786d2d3f15849d610beb81fb3633d0460899038a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6773 5500 bytes
font_01_sfnt_off00007a0d.bin
0a2da80e0ef4b86abbb6b30678acee4623aaf3d4a81f9036752172a3ee3c8768
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0D 9736 bytes