Malicious PDF — malware analysis report

Static analysis result for SHA-256 708b6bdcccf29d40…

MALICIOUS

PDF

39.0 KB Created: 2020-08-11 02:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90f7fd7be3028c185f481571f10f0f56 SHA-1: 4a9c163a0f50acc4522c257d7f599cd8fb923a16 SHA-256: 708b6bdcccf29d4071ffa5ad458e5b346f2ab2b139dc0cd13cb4cbf3abcc6c93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=bile%25C5%259Fiklerin+adland%25C4%25B1r%25C4%25B1lmas%25C4%25B1+test+pdf
    • http://files.koalapouches.com/uploads/1/3/1/3/131398141/vunujofu-xesebutonus-vudusewij-suvinev.pdf
    • http://mexugorum.martha-king.com/uploads/1/3/1/4/131408899/6d6317445d.pdf
    • http://files.nickseifert.com/uploads/1/3/2/6/132683137/9e82fd797aeba.pdf
    • http://files.cobramwillows.com/uploads/1/3/1/3/131380005/9974581.pdf
    • http://files.mychristianoccasion.com/uploads/1/3/0/9/130969740/829019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/bafuvekugujujapexon.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/cbt_worksheet_for_anxiety.pdf
    • https://cdn.shopify.com/s/files/1/0428/5503/9135/files/82123105981.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/73737441276.pdf
    • https://cdn.shopify.com/s/files/1/0432/3504/9640/files/jefaxaxaditesuvebelekedol.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/bilureranurujekorofugigo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9496/files/jubovugobod.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/xumewesenatitujowibumaf.pdf
    • https://cdn.shopify.com/s/files/1/0448/4582/6205/files/69558538376.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0261/files/27578035031.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7221/files/hardest_brain_teasers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a3d.bin
7ae0e7b7a9a6742fe8fb95d2e416a3c9c9c4b33141afceae4a2c9c161a6cce08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A3D 5260 bytes
font_01_sfnt_off00005b7a.bin
bad09282dacc0e1c4b65feef849bf73c495e0976742ed136f189a22c327cc371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7A 11044 bytes
font_02_sfnt_off00007ec4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC4 4324 bytes

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