Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d396d770c6cf3b…

MALICIOUS

PDF

35.0 KB Created: 2020-08-11 18:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7caefc4e5c0dd0d109a61cddfef3c84 SHA-1: 4ead1baa98b28cbe3aa0573c2661f53a950b2293 SHA-256: a4d396d770c6cf3bde0d7984a55b739c46c4ab9107932b1e5d4293af0ef69337
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a PDF link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=calculus+1+with+precalculus+pdf
    • http://files.rethanksaz.com/uploads/1/3/1/8/131856646/xidebuxani.pdf
    • http://kekaz.janaetabony.com/uploads/1/3/1/4/131407164/nominom_lopolawiz_jitif.pdf
    • http://dugawudet.hartmangardens.net/uploads/1/3/1/4/131453574/4648288.pdf
    • http://files.genesisoutdoorservices.com/uploads/1/3/2/6/132681026/samipate.pdf
    • http://zokig.saintgabriels.org/uploads/1/3/1/8/131871674/225541.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/favasiravujepakuwoxevenus.pdf
    • https://cdn.shopify.com/s/files/1/0438/4794/2304/files/free_online_poker_games_with_fake_money.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/bevuxogibazukerilimadabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/51937294860.pdf
    • https://cdn.shopify.com/s/files/1/0434/5430/0312/files/gedegorukojabajipe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/pijibupuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/25070363958.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/jufubu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/eye_of_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0438/5384/0534/files/fisetawexizotagip.pdf
    • https://cdn.shopify.com/s/files/1/0438/1766/4674/files/genetically_modified_organisms_journal.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9610/files/mass_rmv_accident_report.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_off00004c2c.bin
7182946dec3b9b3a4e4ae9b9b038f4a2af28ead16a98624c5541a3a0cdacfbad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2C 5292 bytes
font_01_sfnt_off00005e38.bin
8fcf26117e154ce0c503c5a112ef8a44a814043a3ddc205c4e74510810b55afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E38 9804 bytes

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